Convert plain text, multi-byte Unicode strings, and emojis into standard or URL-safe Base64 entirely within your browser.
Understand binary encoding fundamentals, how to embed inline data URIs, construct Basic Authentication headers, and safeguard sensitive data client-side.
Base64 takes 8-bit binary data (raw bytes with 256 possible values) and converts it into a safe 64-character subset of 7-bit ASCII characters. Because 2^6 = 64, every 6 bits of binary data corresponds to exactly one ASCII character.
When three 8-bit bytes (24 bits total) are processed, they produce four 6-bit Base64 characters. If input byte lengths are not divisible by three, trailing padding characters (= or ==) are appended automatically.
When encoding API keys, SSH fragments, or webhook secrets, uploading your strings to external web servers introduces severe data breach hazards.
Todoalβs Base64 Encoder processes your text entirely inside your web browserβs V8/SpiderMonkey JavaScript runtime. Zero analytics, zero logging, and zero network transmission ensure enterprise-grade confidentiality.
Streamline your daily engineering and formatting tasks with Todoal's connected suite of developer utilities:
Need to verify the decoded plaintext of an encoded payload or debug incoming data? Switch instantly to the Base64 Decoder.
Working with JSON Web Tokens? Decode header claims, user scopes, and expiration dates seamlessly using our JWT Decoder.
Before encoding JSON data into a Base64 string for transport, format and validate your objects with the JSON Formatter.
For HTTP GET parameter passing and web markup safety, percent-encode query strings with URL Encoder and escape HTML characters with HTML Encoder.
Authorization: Basic <base64(username:password)>.data:image/png;base64,... to reduce HTTP round-trip requests.Actionable frameworks, neuroscience-backed habit protocols, and focus strategies.
Todoal
Build your Winter Arc 2026 with a simple 90 day routine for daily priorities habits focus planning and consistent progress without overcomplicating it
Looking for a Todoist alternative? Compare Todoal and other Todoist alternatives for daily tasks priorities simple planning and focused productivity
Learn how to create a daily task to do list online to organize priorities plan your day and stay focused without complicated productivity tools
Actionable frameworks, neuroscience-backed habit protocols, and focus strategies.
Todoal
Build your Winter Arc 2026 with a simple 90 day routine for daily priorities habits focus planning and consistent progress without overcomplicating it
Looking for a Todoist alternative? Compare Todoal and other Todoist alternatives for daily tasks priorities simple planning and focused productivity
Learn how to create a daily task to do list online to organize priorities plan your day and stay focused without complicated productivity tools
Everything you need to know about this browser tool and privacy.
Stop juggling scattered notes and infinite task lists. Todoal helps you lock in your 4 top daily priorities, keep daily habits on track with permanent reminders, and start every morning with focus.
Explore other free, 100% client-side developer and image utilities.
Resize image dimensions with aspect ratio lock, percentage presets, and output quality controls.
Compress PNG, JPG, and WebP images client-side with interactive before/after visual comparison.
Crop, rotate, and flip images with custom aspect ratios (1:1, 16:9, 4:3, 9:16) locally.
Convert between JPG, PNG, and WebP formats instantly with zero server uploads.
Apply adjustable Gaussian blur effects to photos and screenshots directly in your browser.
Pixelate images and censor sensitive areas with customizable pixel block sizes.