Base64URL Encoder & Decoder
Encode UTF-8 text as URL-safe Base64 or decode Base64URL strings. Control = padding and recover the original bytes locally, without uploading tokens.
Your result will appear here.
How to encode and decode Base64URL
- Choose Encode for text or Decode for a Base64URL string.
- Paste the content. Leave padding off unless the receiving system requires = characters.
- Copy the result. For a complete JWT, use the JWT decoder instead of pasting all three parts here.
Working with Base64URL Encoder & Decoder
Base64URL replaces + and / with - and _. Padding is optional in many protocols. Choose this form for URL parameters and token segments, but follow the padding rules of the receiving system.
Base64URL example without padding
- Input
Hello, world! 👋- Result
SGVsbG8sIHdvcmxkISDwn5GL
Questions about Base64URL Encoder & Decoder
How does Base64URL differ from Base64?
Base64URL uses - instead of + and _ instead of /. Padding may be omitted when the receiving format allows it. The decoded bytes are the same.
Does Base64URL need = padding?
Not always. JWT uses unpadded Base64URL, while other systems may expect padding. This encoder omits it by default; the decoder accepts valid padded and unpadded input.
Is Base64URL the same as URL encoding?
No. Base64URL represents bytes with a URL-safe alphabet. URL encoding escapes characters as percent sequences such as %20. Use the URL encoder for query values and form fields.
Can I decode a whole JWT here?
A JWT has separate dot-delimited parts. Decode a single Base64URL part here, or use the JWT tool to inspect the header and payload together. Decoding does not verify a signature.
Are my files, tokens or text uploaded?
No. These tools process your input in your browser. The website serves the page and its code, but your input is not sent to a conversion server or saved in an account.
Related tools for your next step
- Base64 Encoder & Decoder
Encode UTF-8 text to Base64 or decode standard and URL-safe Base64. Control padding and line wrapping.
- JWT Decoder
Read JWT headers and payloads, inspect expiry and activation times, and view claims without sending your token anywhere.
- URL Encoder & Decoder
Encode and decode URL components, complete URLs and form values. Handle percent escapes and spaces correctly.
Common tasks and examples
- Base64 Decoder
Decode Base64 to readable UTF-8 text, or download the original bytes.
Explore all developer tools
Encoding & Files
Move between text, bytes, URLs and embedded images without changing your original data.
Base64 Encoder & Decoder
Encode UTF-8 text to Base64 or decode standard and URL-safe Base64. Control padding and line wrapping.
Image to Base64
Convert PNG, JPEG, GIF, WebP, SVG and other recognised image files to Base64 Data URIs in your browser.
Base64 to Image
Decode a Base64 image or Data URI, preview supported image types and download the original image bytes.
File to Base64
Encode any file to a Base64 string, with optional Data URI prefix, padding and MIME line wrapping.
Base64 to File
Turn Base64 strings and Data URIs back into downloadable files without changing the decoded binary data.
URL Encoder & Decoder
Encode and decode URL components, complete URLs and form values. Handle percent escapes and spaces correctly.
HTML Entity Encoder & Decoder
Convert text and Unicode characters to HTML entities, or decode named and numeric HTML character references.
Unicode Inspector & Escape Converter
Inspect Unicode code points, UTF-8 bytes and UTF-16 units, or convert JavaScript Unicode escapes to readable text.
Data & Text Inspection
Read structured data, inspect tokens and understand exactly what changed.
JSON Formatter, Minifier & Validator
Format, minify and validate JSON with exact large-number preservation, indentation options and recursive key sorting.
JWT Decoder
Read JWT headers and payloads, inspect expiry and activation times, and view claims without sending your token anywhere.
Text Diff Checker
Compare two texts by line, word or character. Highlight additions and removals while retaining spaces and line breaks.
Regular Expression Tester
Test JavaScript regular expressions with flags, match positions, capture groups and named groups in your browser.
Hashes, IDs & Schedules
Check file integrity, generate identifiers and make sense of times and recurring schedules.
MD5 Hash & File Checksum
Calculate an MD5 hash for text or a local file, and compare it with an expected checksum.
SHA-1 Hash & File Checksum
Calculate SHA-1 hashes for UTF-8 text or files and compare the result with an expected checksum.
SHA-256 Hash & File Checksum
Generate SHA-256 hashes for text or files and check a downloaded file against its published checksum.
SHA-512 Hash & File Checksum
Calculate SHA-512 text and file hashes locally and compare full hexadecimal checksums.
CRC32 Checksum Calculator
Calculate standard CRC-32 checksums for text or files and compare eight-character hexadecimal results.
HMAC Generator
Generate HMAC-SHA-1, HMAC-SHA-256 and HMAC-SHA-512 with a UTF-8 or hexadecimal secret key.
UUID & GUID Generator
Generate random UUID v4 or time-ordered UUID v7 identifiers, individually or in batches.
Unix Timestamp Converter
Convert Unix seconds, milliseconds and ISO 8601 dates. View the same instant in UTC and any IANA time zone.
Cron Expression Parser
Validate five- or six-field Cron expressions and list upcoming runs in an IANA time zone, including daylight-saving changes.
Cron Expression Generator
Build a Cron expression from time fields or common presets, then preview its next scheduled times in your chosen zone.
Your input and files are processed on your device. Keep sensitive results out of shared clipboards and use a trusted device for private keys and tokens.