Free Base64 Encoder & Decoder Online

Base64 encodes binary data such as images and files as plain text so it can travel safely through systems built for text. Common uses include embedding images in HTML or CSS as data URIs, attaching files in email via MIME, carrying file data inside JSON API payloads, and the encoded segments of JWT tokens. It keeps data intact across channels that might otherwise corrupt raw bytes.

Helperzy Base64 Encoder mein apna text paste karo aur Encode dabao. Base64 string turant ready ho jayega — bilkul free. Decode karne ke liye Base64 string paste karke Decode dabao, original text wapas mil jayega. Sab kuch aapke browser mein hota hai.

Yes. Paste your Base64 string, click Decode, and get the original text or file back instantly. If the string is not valid Base64 — for example it contains characters outside the Base64 alphabet or has incorrect padding — the tool will let you know so you can check where the string was copied from.

Yes. Upload an image and Helperzy converts it to a Base64 data URI that you can embed directly in HTML or CSS using a data:image prefix. This is handy for small icons or inline graphics that you want to bundle without a separate file request, though large images are usually better served as normal files.

No, and this is important. Base64 is reversible encoding, not encryption — anyone can decode a Base64 string in seconds with no key. Never use it to protect passwords, tokens, or sensitive data thinking it hides anything. If you need to keep data secret, use real encryption such as AES; use Base64 only to make binary data text-safe.

Standard Base64 uses the characters + and /, which have special meaning inside URLs and can break a link or query parameter. URL-safe Base64 replaces them with - and _ so the encoded value can sit safely in a URL or filename. If you are putting Base64 into a query string or path, use the URL-safe variant to avoid encoding issues.

Base64 represents every three bytes of input using four output characters, so the encoded result is roughly 33% larger than the source data. This size overhead is the trade-off for making binary data safe to transmit as text. It is why embedding very large files as Base64 can increase payload size noticeably compared to sending the raw file.

Yes. You can encode any file to Base64 — PDFs, audio, fonts, or arbitrary binary — and decode Base64 back into a downloadable file. This is useful for inspecting file attachments in API requests or moving small binaries through text-only channels. Keep in mind that very large files will produce very long strings and may be slow to process in the browser.

Yes. All encoding and decoding happen locally in your browser using JavaScript. Nothing you paste or upload is sent to a server or stored, so it is safe for sensitive content. That said, remember that Base64 itself offers no security — the privacy here comes from the processing staying on your device, not from the encoding.