JSON Formatter and Validator
Format, compress, and validate JSON. See the exact location of syntax errors and optionally sort object keys.
Local processingBase64 Encoder and Decoder
About this tool
Convert UTF-8 text or small files to Base64, or decode Base64 into readable text or a downloadable file. Choose a URL-compatible form when preparing content for JWTs or URLs.
Features
- Encode and decode text or small files
- URL-compatible Base64 form
- Display output size and final padding information
- Copy decoded text or download the decoded file
How to use
- Choose mode: Select encode or decode and text vs file input.
- Provide input: Paste a string or pick a file under the recommended size.
- Copy output: Grab Base64 text or save decoded binary locally.
Examples
- Create a data URL for a small image or SVG file
- Read Base64 content received from an API
- Create a URL-compatible value for a query parameter
- Store a small text setting in an encoded form
Limitations
- Large files may exceed browser memory—keep under ~5 MB
- Decoding invalid Base64 shows a clear error
- The entered text or selected file is processed directly in your browser and is not sent to a server.
FAQ
- What is URL-safe Base64?
- It replaces "+" and "/" with "-" and "_" and may omit the final padding characters. This form is commonly used in JWTs and URLs.
- Can I decode to a file?
- Yes. Decoded binary can be downloaded with an appropriate file extension you choose.
- Does encoding increase size?
- Base64 expands binary size by roughly 33% due to 4-character encoding of 3 bytes.