Free Online Tools for Everyone
Compress images, convert PDFs, format code, generate QR codes and more. Browser-based tools run entirely on your device — your data never leaves your browser.
What is Helperzy?
Helperzy is a free collection of 500+ browser-based tools built for developers, designers, students, marketers, and anyone who works with files and data daily. The toolset spans image compression and conversion, PDF editing, text utilities, code formatters, unit converters, financial and health calculators, SEO helpers, color pickers, and more. Every tool processes your input locally using JavaScript that runs inside your own browser tab — nothing is uploaded to a server, no account is required, and there are no usage limits. That means sensitive documents, personal photos, and proprietary code stay on your device from start to finish. Whether you need to shrink a screenshot for an email, decode a JWT on a production system, calculate a loan EMI, or generate a QR code for a restaurant menu, Helperzy gives you an instant result without installs or signups. The tools work on any modern device — desktop, tablet, or phone — and stay fast because there is no server round-trip slowing things down.
🔥 Most Popular
Image Compressor
Advanced AI-powered image compressor — reduce JPG, PNG, WebP, AVIF file size up to 90% online for free while preserving 90%+ visual quality. Batch compression, format conversion, side-by-side comparison, and ZIP download. 100% browser-based, no upload needed.
Background Remover
AI-powered background remover — remove background from any image instantly. Works on portraits, products, animals, logos. Get transparent PNG in seconds, 100% free and private.
JPG to PNG Converter
Convert JPG to PNG (default) or any format online free — WebP, AVIF, BMP, TIFF, GIF, PDF, ICO. Lossless quality, transparent PNG support, batch processing with ZIP download, resize, rotate, flip. 100% browser-based, no upload.
Image Cropper
Professional image cropper online free — shape crop (circle, oval, square, rounded rectangle), aspect ratio presets, social media sizes, rotate, flip, and lossless HD export. Crop for Instagram, YouTube, passport, A4, and more. Adjustable corner radius slider. 100% browser-based.
Image Watermark Tool
Professional image watermark tool online free — add text or logo watermarks with custom fonts, opacity, rotation, blend modes, tile patterns, and drag positioning. Batch watermark multiple images, export in HD/4K, download as ZIP. 100% browser-based.
Image Blur Tool
Professional image blur tool online free — Gaussian blur, pixelate/mosaic, and motion blur. Blur entire images or draw rectangles to blur specific areas (faces, text, plates). Batch processing, multiple export formats. 100% browser-based.
📈 Trending Now
Image Resizer
Image Resizer changes image dimensions online — set exact pixels, use percentage scaling, or pick from 12 presets (Instagram, Passport, YouTube, etc.). Target specific file sizes like 50KB or 100KB. Batch resize multiple images. 100% free, browser-based.
Image Converter
Image Converter changes images between any format online free — JPG, PNG, WebP, AVIF, PDF, ICO, BMP, HEIC, GIF, SVG. Batch conversion, resize, rotate, flip, AI format recommendation. 100% browser-based, no upload.
JPG to WebP Converter
Convert JPG to WebP format online free — reduce image file size by 25-35% with identical visual quality. Batch conversion, adjustable quality, lossless mode available. Boost website speed and Core Web Vitals scores. 100% browser-based, no upload needed.
PNG to WebP Converter
Convert PNG to WebP format online free — reduce file size by 26-34% while preserving full transparency. Batch conversion, lossless and lossy modes, adjustable quality. Boost website performance and Core Web Vitals. 100% browser-based, no upload needed.
Image Flip Tool
Image Flip Tool flips photos horizontally or vertically online for free. Mirror images and download instantly in your browser with no upload.
Add Text to Image
Add Text to Image lets you put custom text on photos online for free. Choose font size, color, and position, then download in your browser with no upload.
All Tools
Image Compressor
Advanced AI-powered image compressor — reduce JPG, PNG, WebP, AVIF file size up to 90% online for free while preserving 90%+ visual quality. Batch compression, format conversion, side-by-side comparison, and ZIP download. 100% browser-based, no upload needed.
Background Remover
AI-powered background remover — remove background from any image instantly. Works on portraits, products, animals, logos. Get transparent PNG in seconds, 100% free and private.
JPG to PNG Converter
Convert JPG to PNG (default) or any format online free — WebP, AVIF, BMP, TIFF, GIF, PDF, ICO. Lossless quality, transparent PNG support, batch processing with ZIP download, resize, rotate, flip. 100% browser-based, no upload.
Image Cropper
Professional image cropper online free — shape crop (circle, oval, square, rounded rectangle), aspect ratio presets, social media sizes, rotate, flip, and lossless HD export. Crop for Instagram, YouTube, passport, A4, and more. Adjustable corner radius slider. 100% browser-based.
Image Watermark Tool
Professional image watermark tool online free — add text or logo watermarks with custom fonts, opacity, rotation, blend modes, tile patterns, and drag positioning. Batch watermark multiple images, export in HD/4K, download as ZIP. 100% browser-based.
Image Blur Tool
Professional image blur tool online free — Gaussian blur, pixelate/mosaic, and motion blur. Blur entire images or draw rectangles to blur specific areas (faces, text, plates). Batch processing, multiple export formats. 100% browser-based.
PDF to Word Converter
Convert PDF files to editable Word documents online. High-quality PDF to DOCX conversion, free and fast.
PDF Compressor
PDF Compressor reduces PDF file size online to make documents smaller for email, upload, and sharing. Maintain quality while shrinking your PDFs for free.
JPG to PDF Converter
Convert JPG images to PDF online for free. Combine multiple images into one PDF document instantly.
PDF to Text Converter
Extract text from PDF files online for free. Convert PDF content to plain text instantly.
PDF to Excel
Convert PDF tables and data to Excel spreadsheets online for free. Extract structured data from invoices, reports, and statements.
Word to PDF
Convert Word documents to PDF online for free. Preserve formatting, headings, and layout in your PDF output.
Word Counter
Count words, characters, sentences, paragraphs & reading time. Supports PDF, DOCX, PPTX uploads. Multilingual — works with Hindi, Arabic, Chinese & more.
Text Repeater
Text Repeater repeats any text multiple times online for free. Set custom separator and line breaks between repetitions.
Text to Speech
Convert text to speech online for free. Multiple voices, adjustable speed and pitch. Listen to any text read aloud in your browser.
Find and Replace
Find and replace text online for free. Supports regex, case-sensitive matching, whole word search, and undo history.
Morse Code Translator
Morse Code Translator converts text to Morse code and Morse code back to text instantly online for free. Decode and encode Morse in your browser.
Case Converter
Case Converter changes text between UPPERCASE, lowercase, Title Case, camelCase, snake_case and more online for free.
UUID Generator
UUID Generator creates random UUIDs (v4) and GUIDs online for free. Generate unique identifiers instantly for databases, APIs, and development. No signup needed.
Image to Base64 Converter
Image to Base64 Converter encodes any image into a Base64 data URI online for free. Get ready-to-use CSS and HTML code in your browser.
JSON to YAML Converter
JSON to YAML Converter changes JSON into clean YAML instantly online for free. Validate and convert config data in your browser with no upload.
Cron Expression Generator
Cron Expression Generator builds and explains cron schedules online for free. Create cron expressions with a plain-English description in your browser.
Hash Generator
Hash Generator creates MD5, SHA-1, SHA-256, and SHA-512 hashes from text online for free. Generate checksums in your browser with no upload.
Base64 Encoder / Decoder
Base64 Encoder / Decoder encodes and decodes Base64 strings online for free. Supports text, files, and images with instant conversion and UTF-8 support.
Loan Calculator
Loan Calculator computes loan EMI, total interest, and repayment schedule online for free. Plan your loan repayments.
Scientific Calculator
Scientific calculator online for free. Perform advanced math calculations with trigonometry, logarithms, and more.
Tip Calculator
Tip Calculator works out the tip amount and splits the bill per person online for free. Set any tip percentage and number of people instantly.
Compound Interest Calculator
Compound Interest Calculator shows how your money grows with compounding online for free. Calculate maturity value, interest, and growth instantly.
Mortgage Calculator
Mortgage Calculator computes your monthly home loan payment, total interest, and total cost online for free. Plan your mortgage instantly in your browser.
Income Tax Calculator
Income Tax Calculator estimates your India income tax under the new and old regimes online for free. Enter income and deductions to compare tax with 4% cess.
QR Code Generator
Generate QR codes for URLs, text, email, phone numbers and more. Download as PNG or SVG, free forever.
Random Number Generator
Random Number Generator picks random numbers in any range online for free. Generate single or multiple numbers, with or without duplicates, in your browser.
Business Name Generator
Business Name Generator creates brandable company and startup name ideas online for free. Enter a keyword and get instant name suggestions in your browser.
WiFi QR Code Generator
Create a WiFi QR code so guests join your network by scanning — no typing passwords. Enter SSID, password and security, then download the QR as PNG.
UPI Payment QR Code Generator
Create a UPI payment QR code for any UPI ID — scan-to-pay for shops, freelancers, and events. Amount optional, works with every UPI app, free.
Instagram Bio Generator
Generate creative Instagram bio ideas online for free. Stand out with a unique, engaging profile bio.
SERP Snippet Preview
SERP Snippet Preview shows how your page will look in Google search results online for free. Check title, URL, and description length in your browser.
Meta Tag Generator
Generate SEO meta tags for your website online for free. Create title, description, and Open Graph tags.
URL Shortener
URL Shortener turns long URLs into short, shareable links. Track clicks and manage your links for free.
URL Encoder / Decoder
Encode and decode URLs online for free. Convert special characters to URL-safe format instantly.
Keyword Density Checker
Check keyword density in your content online for free. Analyse word frequency and optimise for SEO.
Open Graph Generator
Generate Open Graph meta tags for social media sharing online for free. Preview how your page looks on Facebook and Twitter.
Converters
Length Converter
Length Converter changes meters, feet, inches, miles, kilometers, and more instantly online for free. Accurate unit conversion in your browser.
Inches to CM Converter
Inches to CM Converter changes inches to centimeters and back instantly online for free. Uses the exact 2.54 factor in your browser.
Kg to Lbs Converter
Kg to Lbs Converter changes kilograms to pounds and back instantly online for free. Uses the standard 2.20462 factor in your browser.
Celsius to Fahrenheit Converter
Celsius to Fahrenheit Converter changes °C to °F and back instantly online for free. Uses the exact C×9/5+32 formula in your browser.
Miles to KM Converter
Miles to KM Converter changes miles to kilometers and back instantly online for free. Uses the exact 1.60934 factor in your browser.
Weight Converter
Weight Converter changes kilograms, pounds, grams, ounces, and more instantly online for free. Accurate mass conversion in your browser.
Color
HEX to RGB Converter
HEX to RGB Converter changes hex color codes to RGB and RGBA values instantly online for free. Live preview and copy-ready CSS in your browser.
Color Picker
Color Picker lets you pick any color and get HEX, RGB, and HSL values instantly online for free. Live preview and copy-ready codes in your browser.
Color Contrast Checker
Color Contrast Checker tests text and background colors against WCAG accessibility ratios online for free. Check AA and AAA compliance in your browser.
RGB to HEX Converter
RGB to HEX Converter changes RGB color values to hex codes instantly online for free. Live preview and copy-ready CSS hex in your browser.
Color Shades Generator
Color Shades Generator creates lighter and darker shades of any color online for free. Build tint and shade palettes instantly in your browser.
CMYK to RGB Converter
CMYK to RGB Converter changes print CMYK color values to on-screen RGB and hex approximations online for free. Live preview and copy-ready CSS in your browser.
Electrical
Ohm's Law Calculator
Ohm's Law Calculator solves voltage, current, resistance, and power online for free. Enter any two values to instantly get the other two.
Wattage Calculator
Wattage Calculator finds power in watts from volts and amps online for free. Multiply voltage by current to get watts and kilowatts instantly.
Electricity Cost Calculator
Electricity Cost Calculator estimates the running cost of any appliance online for free. Enter watts, hours, days, and your rate to see daily and total cost.
Battery Life Calculator
Battery Life Calculator estimates how long a battery lasts online for free. Divide battery capacity in mAh by device current draw to get runtime in hours.
LED Resistor Calculator
LED Resistor Calculator finds the right current-limiting resistor for an LED online for free. Enter supply voltage, LED voltage, and current to get the resistor value.
Voltage Divider Calculator
Voltage Divider Calculator finds the output voltage of a two-resistor divider online for free. Enter Vin, R1, and R2 to get Vout, current, and power.
Health
Calories Burned Calculator
Calculate calories burned during exercise using METs, your body weight and duration. Pick an activity from the MET table for an instant, accurate estimate.
Body Surface Area (BSA) Calculator
Body Surface Area (BSA) Calculator shows the Du Bois, Mosteller and Haycock formulas side by side from your height and weight. Free, private, browser-based.
eGFR Calculator (CKD-EPI 2021)
eGFR Calculator uses the race-free CKD-EPI 2021 equation to estimate kidney function and CKD stage from serum creatinine, age and sex. Free and private.
TDEE Calculator
TDEE Calculator finds your Total Daily Energy Expenditure online for free. Get daily calorie needs by activity level using the Mifflin-St Jeor formula.
Protein Intake Calculator
Protein Intake Calculator finds your daily protein needs in grams online for free. Calculate protein based on body weight and your fitness goal.
One Rep Max Calculator
One Rep Max Calculator estimates your 1RM from weight and reps online for free. Uses the Epley formula and shows a full percentage training chart.
Math
Triangle Calculator
Solve any triangle from SSS, SAS, ASA, AAS or SSA and get sides, angles, area, altitudes, medians, inradius and circumradius. The SSA ambiguous case shows both valid triangles.
Mean, Median, Mode & Range Calculator
Paste any list of numbers to get the mean, median, every mode, range, quartiles, IQR, outliers and both sample and population standard deviation, clearly labelled.
Square Root Calculator
Square Root Calculator finds the square root of any number online for free. Also shows cube root and fourth root instantly.
Exponent Calculator
Exponent Calculator raises any base to any power online for free. Compute powers, squares, cubes, and negative or decimal exponents instantly.
Factorial Calculator
Factorial Calculator computes n! for any whole number online for free. Get factorials instantly with clear handling of large and invalid inputs.
Prime Number Checker
Prime Number Checker tells you if a number is prime online for free. Instantly check primality and see the smallest factor if it is not prime.
DateTime
Stopwatch
Free online stopwatch with lap times and 10ms precision. Start, stop, lap, and reset instantly in your browser — no download or signup needed.
Pomodoro Timer
Free online Pomodoro timer with a 25-minute focus and 5-minute break cycle. Boost productivity with customizable work and break intervals — runs in your browser.
Week Number Calculator
Find the ISO 8601 week number for any date online for free. See the week number, weekday, and day of year instantly — accurate for week 1 to 53.
Date to Day Converter
Find out what day of the week any date falls on. Enter a past or future date to instantly see the weekday, full date, and whether it is a weekend — free online.
Hours Calculator
Calculate hours and minutes between a start and end time online for free. Deduct breaks, handle overnight shifts, and get decimal hours for timesheets and payroll.
Add or Subtract Days
Add or subtract days, weeks, months, or years from any date online for free. Find a future or past date instantly for deadlines, due dates, and planning.
Marketing
ROAS Calculator
ROAS Calculator finds your return on ad spend online for free. Enter revenue and ad spend to instantly get ROAS as a ratio and percentage.
CPM Calculator
CPM Calculator finds cost per thousand impressions online for free. Enter any two of cost, impressions, or CPM and instantly solve for the third.
CPC Calculator
CPC Calculator finds your cost per click online for free. Enter total cost and clicks to instantly get average cost per click, or solve for cost or clicks.
CTR Calculator
CTR Calculator finds your click-through rate online for free. Enter clicks and impressions to instantly get CTR as a percentage using clicks ÷ impressions × 100.
Conversion Rate Calculator
Conversion Rate Calculator finds your conversion rate online for free. Enter conversions and visitors to instantly get the rate as a percentage.
CPA Calculator
CPA Calculator finds your cost per acquisition online for free. Enter total cost and conversions to instantly get cost per acquisition using cost ÷ conversions.
Audio & Video
Online Metronome
Online Metronome is a free browser metronome that keeps steady time using the Web Audio API. Set BPM, time signatures, accents, subdivisions, and tap tempo with no download.
Tone Generator
Tone Generator produces a pure tone in your browser using a Web Audio oscillator. Choose frequency, waveform, and musical notes, then export the tone as a WAV file for free.
Video to GIF Converter
Video to GIF Converter turns a video clip into an animated GIF entirely in your browser. It captures frames with canvas and encodes with gif.js, so nothing is uploaded.
Subtitle Converter (SRT to VTT)
Subtitle Converter (SRT to VTT) converts subtitle files between SRT, WebVTT, and SBV formats entirely in your browser, and reads ASS/SSA dialogue for extraction. It fixes the comma-versus-dot timestamp difference and adds the required WEBVTT header automatically.
Subtitle Timing Shifter
Subtitle Timing Shifter fixes out-of-sync subtitles by retiming SRT or WebVTT files in your browser. It can shift every cue by a signed amount, scale for frame-rate drift, or move only the cues after an anchor point.
Education
GPA to Percentage Converter
Convert GPA or CGPA to percentage across common scales — 10-point CBSE (×9.5), US 4.0, 4.3 and 5.0 — and reverse a percentage back to GPA, with the exact formula shown for each result.
CGPA to Percentage Calculator
Convert CGPA to percentage using the correct formula for your board or university — CBSE, VTU, Anna, Mumbai, SPPU, GTU or generic 10-point — and compute CGPA from grade points and credits.
Grade Calculator
Calculate your weighted course grade from assignment scores, or work out the exact score you need on the final exam to reach a target grade. Includes a points mode and letter grades.
Citation Generator
Generate accurate citations in APA 7, MLA 9, Chicago 17, Harvard, IEEE, and Vancouver styles for books, journal articles, websites, and more, with matching in-text citations.
Attendance Percentage Calculator
Calculate your attendance percentage and find exactly how many classes you must attend to reach 75% — or how many you can safely skip and still stay above the requirement.
Marks to Percentage Calculator
Calculate exam percentage from marks per subject, with CBSE best-of-5 mode, grade bands (A1 to E), highest and lowest subject, and a reverse mode for marks needed to hit a target.
Business
Invoice Generator
Create professional invoices with GST mode (CGST/SGST or IGST), multi-currency support, line-item discounts, amount in words, and a print-ready PDF — all generated in your browser.
Rent Receipt Generator
Generate rent receipts for HRA claims, with an automatic landlord-PAN prompt when annual rent exceeds Rs 1,00,000 and a bulk mode for a full year of receipts in one PDF.
Salary Slip Generator
Create professional payslips with earnings and deductions, automatic PF at 12% of basic with the Rs 15,000 ceiling option, net pay in words, and multi-employee ZIP export.
Quotation Generator
Create professional price quotations with a validity date, optional line items excluded from the total, terms and conditions templates, and one-click convert-to-invoice.
Purchase Order Generator
Create professional purchase orders with separate bill-to and ship-to addresses, per-line delivery dates, auto-incrementing PO numbers, and a print-ready PDF — all in your browser.
Resume Builder
Build an ATS-friendly resume with selectable-text PDF and DOCX export, reorderable sections, action-verb suggestions, and a live preview — all generated in your browser.
Network
MAC Address Formatter & Analyzer
Format MAC addresses between colon, hyphen, Cisco dot, and bare notations. Analyze I/G and U/L bits, generate EUI-64 interface identifiers for IPv6 SLAAC, and create random locally-administered MACs — all 100% client-side.
IP Subnet Calculator
Calculate network address, broadcast, first and last usable hosts, wildcard mask, and total host count from any IPv4 address and prefix length or subnet mask.
CIDR Calculator
Expand CIDR notation to IP ranges (IPv4 and IPv6), split a block into smaller subnets, check overlap between two CIDRs, and summarize multiple prefixes into the smallest covering supernet.
Port Number Lookup
Look up common TCP/UDP port numbers, their associated protocols, and security notes. Search by port number or service name across a curated reference of approximately 100 commonly queried ports.
Bandwidth & Download Time Calculator
Calculate how long a download takes at a given connection speed, or the speed needed to finish in a set time. Handles the Mbps vs MB/s confusion, decimal vs binary bytes, and TCP overhead — all in your browser.
IPv4 to IPv6 Converter
Encode an IPv4 address into every standard IPv6 form — IPv4-mapped, 6to4, and NAT64 — and compress or expand any IPv6 address to its RFC 5952 canonical form, all in your browser.
Security
File Hash & Checksum Verifier
Compute MD5, SHA-1, SHA-256, SHA-384, SHA-512, and CRC32 hashes of any file and verify them against a published checksum. Runs entirely in your browser — no upload.
TOTP Code Generator
Generate time-based one-time passwords (TOTP) from a Base32 secret for testing and verifying your own 2FA setup. Supports SHA-1/256/512, 6-8 digits, and otpauth URIs — nothing is stored.
Passphrase Generator
Generate memorable, high-entropy passphrases from random words using cryptographic randomness. Shows entropy in bits and estimated crack time. Everything runs in your browser.
Secret Key & API Key Generator
Generate cryptographically secure random secret keys for JWT, API keys, session secrets, and encryption keys in hex, base64, base64url, or alphanumeric. Runs entirely in your browser.
File Encryption Tool
Encrypt and decrypt any file with a password using AES-256-GCM and PBKDF2 (600,000 iterations) via WebCrypto. Authenticated encryption detects tampering. Nothing is uploaded.
Content-Security-Policy Generator
Build a Content-Security-Policy header directive by directive with plain-language explanations, unsafe-inline warnings, presets, and nonce support. Outputs header, report-only, and meta tag.
Science
Molar Mass Calculator
Type any chemical formula to get its molar mass in g/mol plus a per-element table of atom counts, atomic weights and mass percent, using IUPAC 2021 atomic weights.
Molarity Calculator
Solve for molarity, solute mass, solution volume or molar mass, run a C₁V₁ = C₂V₂ dilution that tells you how much stock and how much solvent to use, and read molality and percent by mass.
pH Calculator
Convert between pH and hydrogen-ion concentration, solve weak-acid Ka problems with both the approximation and the exact quadratic, and mix Henderson–Hasselbalch buffers — all client-side.
Half-Life Calculator
Solve any of the four variables in radioactive decay — remaining amount, elapsed time, half-life or initial amount — with independent time units for t½ and t, isotope presets, and a decay curve.
Ideal Gas Law Calculator
Solve PV = nRT for pressure, volume, moles or temperature, with the correct gas constant automatically matched to your chosen units and shown on screen.
Wind Chill & Heat Index Calculator
Calculate the official NWS wind chill or heat index from temperature, wind speed and humidity, with an honest message whenever conditions fall outside where the formula is defined.
Professional standards, zero cost.
Helperzy is built for everyone — developers, students, and professionals who need fast, reliable tools without the friction.
Always Private
Browser-based tools run 100% on your device. Your files are never uploaded, never seen by us, never stored anywhere.
Edge Optimised
Processes are distributed across global edge nodes for minimum latency. Server-side files auto-deleted in 60 minutes.
Always Free
Every tool is free forever. No account, no credit card, no email required. Open a tool and start in seconds.
Works Everywhere
No software to install. All browser-based tools use modern Web APIs — fast, offline-capable, and always available.
Common Questions
Absolutely. For all browser-based tools your files never leave your device — processing happens entirely in your browser. For server-side tools like PDF to Word, files are encrypted in transit, processed in isolated memory, and permanently deleted within 60 minutes.
Get in touch
Have a tool request, found a bug, or want to report a security concern? We read every message and typically reply within 24 hours.
- Tool requests & feature ideas
- Bug reports & feedback
- Security concerns or responsible disclosure
- Partnership & business enquiries
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