Base64 Encoder: Text & Files, Unicode-Safe
Type or paste text, or drop in a file, and get correct Base64 the instant you do. Emoji and accents encode without mojibake, files become ready-to-embed data URLs, and there's a URL-safe switch for tokens and query strings. 100% in your browser. No uploads, no limits.
What is the base64 encoder?
The Base64 Encoder converts text or any file to Base64 the moment you enter it, encoding through UTF-8 so emoji and accents round-trip cleanly. Drop in an image, PDF or font to get a ready-to-embed data URL, and flip the URL-safe toggle for JWTs and query strings. Free, and everything stays in your browser.
The GigAI Base64 Encoder converts text and files to Base64 the moment you enter them. No 'Encode' button to hunt for. Under the hood it encodes through the browser's TextEncoder before btoa, so it's genuinely UTF-8 correct: emoji, curly quotes, accented characters and CJK all round-trip cleanly, unlike naive tools that call btoa on a raw string and choke on anything outside Latin-1. Drop in an image, PDF, font or any binary and you instantly get both its raw Base64 and a copy-paste `data:` URL you can paste straight into CSS, an <img> src or a JSON payload. Flip the URL-safe toggle to swap +/ for -_ and drop padding for JWT segments, query parameters and URL slugs. Everything happens locally in a Web Worker-free, dependency-light path, your text and files never leave the tab.
- Difficulty:
- Easy
- Typical time:
- ~15s
- Processing:
- 100% browser processing
Last updated
How to use the base64 encoder
- 1
Choose text or file
Use the Text tab to type or paste content, or switch to the File tab and drop a file in. You can also just drag a file anywhere onto the workspace.
- 2
Enter your input
Type, paste (Ctrl/Cmd+V), import a text file, or drop a binary file. The Base64 output updates instantly beside it.
- 3
Pick standard or URL-safe
Leave the toggle off for classic Base64, or turn on URL-safe to get -_ characters and no padding for tokens and query strings.
- 4
Copy, download or share
Copy the Base64 (or the data: URL for files) with one click, download it as a .txt file, or generate a shareable link that reopens your input.
What Base64 Encoder includes
Instant, live encoding
Base64 appears as you type or the moment a file lands: there's no button to press and no page reload. Edit the input and the output updates in the same keystroke.
Genuinely Unicode-safe
Text is encoded through UTF-8 first, so emoji, accents, smart quotes and CJK characters produce correct Base64. Tools that call btoa directly break on all of these. This one doesn't.
Files become data URLs
Drag in an image, PDF or font and get both the raw Base64 and a ready-to-embed data: URL. Paste it straight into CSS background-image, an <img> src or a JSON body.
URL-safe toggle
One switch swaps + and / for - and _ and strips = padding, giving you Base64URL that's safe to drop into JWT segments, query strings and URL paths.
100% private, in-browser
Your text and files are encoded locally with the Web platform's own APIs. Nothing is uploaded, stored or logged, close the tab and it's gone.
Keyboard-first workflow
Paste, copy, share, undo and redo are all one shortcut away, with an on-screen cheat sheet. Fewer clicks than any encoder you've used before.
Why use our base64 encoder
Correct output, every character
Because encoding goes through UTF-8, the Base64 you copy will decode back to exactly what you put in. No '?' boxes, no garbled emoji, no silent data loss.
One tool for text and binaries
Switch between a text pane and a file drop zone in the same workspace. Encode a config snippet now and an SVG icon the next minute without leaving the page.
Private by design
Everything runs in your browser tab using native APIs. Sensitive tokens, keys and documents never touch a server, so there's nothing for anyone to intercept.
Free, unlimited, no account
Encode as much as you like. No sign-up, no daily quota, no watermark. The only real limit is your device's memory when encoding very large files.
Built for the way you work
From quick one-off fixes to daily workflows, see how people put this tool to use.
- Developer
Embed assets without a request
Turn a small icon or web font into a data: URL and inline it in CSS or HTML, cutting a network round-trip and avoiding CORS headaches for tiny assets.
- API engineer
Build request payloads by hand
Base64-encode a binary attachment or credential to drop into a JSON body or an Authorization header while testing an endpoint in curl or Postman.
- Security & QA
Craft and inspect tokens
Use URL-safe mode to assemble JWT-style segments or encode test fixtures, then hand the value straight to the Base64 decoder to confirm it round-trips.
- Content & email
Inline images in templates
Convert a logo to a data URL so it renders in email clients and static templates that can't reliably load external image files.
Supported formats
Accepts Text and Any file (image, PDF, font, binary), and produces Base64, Base64URL and Data URL, all processed locally in your browser.
- Text
- Any file (image, PDF, font, binary)
- Base64
- Base64URL
- Data URL
Frequently asked questions
Recommended tools
Base64 Decoder
Decode Base64 back to text or a file instantly: Unicode-safe, auto-detects URL-safe input, sniffs binary data and offers a download. Runs fully in your browser, nothing uploaded.
URL Encoder
Percent-encode text and URLs instantly: pick component mode for query values or full-URL mode to preserve structure, with a per-line batch switch. 100% in your browser, nothing uploaded.
JWT Decoder
Decode and inspect any JSON Web Token instantly. Read the header, payload and signature, see when it was issued and expires, and optionally verify an HS256 signature. 100% in-browser. Your token never leaves your device.
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Build and decode cron expressions visually. Pick presets or per-field rules, read a plain-English description, and preview the next 5 run times. Paste an expression to reverse it back. Runs entirely in your browser.
Comparisons & guides
Go deeper on the concepts behind the base64 encoder.
Base64 vs Binary: When Should You Encode Your Data?
ComparisonBinary is the raw, compact form of data. Base64 is a text-safe encoding of it that's ~33% larger. Here's when encoding to Base64 helps and when it just wastes bytes.
Read the comparisonHow to Decode a JWT (Read Its Header & Payload)
GuidePaste a JSON Web Token and read its header and claims in plain JSON, inspect the algorithm, expiry and scopes while debugging auth. A safe, browser-only guide.
Read the guideCommon problems, solved
Hit a snag? Here are quick fixes for the issues people run into most.
My emoji or accented text comes out as gibberish elsewhere.
The output here is UTF-8 correct. Make sure whatever decodes it also treats the bytes as UTF-8. A decoder that assumes Latin-1 will mangle multi-byte characters. Our Base64 decoder handles this automatically.
My URL-safe Base64 is rejected as invalid Base64.
URL-safe output intentionally uses - and _ and omits = padding. Decode it in URL-safe mode (or add padding back), feeding it to a strict standard-Base64 parser will fail by design.
A large file is slow to encode or freezes briefly.
Very large files are held entirely in memory while they encode. Try a smaller file, close other heavy tabs, or use a desktop browser with more available RAM.
I want the raw bytes, not a data: URL, for my file.
The file result gives you both. The data: URL is shown for embedding, and the raw Base64 (everything after the comma) is available to copy separately for API payloads.
Get the most out of it
Drop a file anywhere on the workspace. You don't have to be on the File tab first. The tool switches for you.
Turn on URL-safe before building JWT segments or query-string values so you never have to hand-edit + / = characters.
For embedding an image in CSS or HTML, copy the full data: URL. For an API body, copy just the Base64 after the comma.
Use the Share button to send a teammate a link that reopens with your exact input already loaded.
Base64 grows data by roughly a third, expect the output to be about 33% larger than the original bytes.
What's new
Recent updates and improvements to the base64 encoder.
Launched the Base64 Encoder with live text encoding, drag-and-drop file support, URL-safe mode, data URLs, copy/download/share and keyboard shortcuts.
Added instant data: URL generation for files and a one-click switch to copy just the raw Base64 without the MIME prefix.
Improved large-file handling with chunked byte processing and clearer error messages for unreadable files.
Keep exploring
Problems we solve
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Your privacy is built in
Every byte is encoded locally in your browser using the platform's TextEncoder and FileReader APIs. Your text and files are never uploaded, stored, logged or shared: nothing leaves your device, and closing the tab discards it all.
- Runs in your browser
- No uploads
- Nothing stored
Ready to try the base64 encoder?
Free, private and instant. Base64 Encoder runs right in your browser.