JSON formatter
Validate JSON syntax and choose pretty formatting or minification.
Enable JavaScript to select files and convert them on your device.
JSON formatter
Convert images, PDFs and data. No account. Your files stay on your device.
THE TOOLBOX
Small tools. Everyday possibilities.
Useful tools for your everyday files.
Image converter
Convert images to JPG, PNG or WebP.
Image compressor
Compress images on your device.
Image resizer
Resize images while preserving aspect ratio.
Images to PDF
Combine images into a PDF.
Merge PDF
Combine PDFs in your chosen order.
Split & extract PDF
Extract selected pages or split each page.
Rotate PDF
Rotate selected PDF pages clockwise.
Table converter
Convert CSV, TSV and flat JSON tables.
JSON formatter
Validate, format or minify JSON.
Text encoding
Encode and decode Unicode text with Base64 or URL encoding.
How does JSON formatter work?
Validate JSON syntax and choose pretty formatting or minification. Paste JSON or choose a JSON file, select the mode, then download the result. For example, a compact object can be reformatted with indentation to make nested values easier to read. Invalid syntax produces an error instead of an output file. This is a syntax formatter, not JSON Schema validation. Parsing and serialization use JavaScript, so numbers beyond safe integer precision and duplicate object keys can change.
How do I convert a file without uploading it?
Choose a tool, add a file with the picker or drag and drop, adjust the output settings, then select Convert files and download the result. The conversion code runs in your browser and does not send selected files or entered conversion text to a conversion server. Results stay in page memory until downloaded. Refreshing or closing the page clears that state, so save your results first and retain your originals until you have checked them.
What are the file and device limits?
A batch supports up to 20 files, 50 MiB per file and 150 MiB in total. Image decoding is limited to 40 megapixels. PDF splitting and rotation take one input PDF at a time; splitting into individual files supports up to 500 outputs. Large decoded images and PDFs may need substantially more memory than their file size. Try fewer files if your device struggles. Current browser decoding and device memory determine whether a particular file can be processed.
How can I check the conversion result?
Open the downloaded result and compare it with your original before relying on it. For images, inspect dimensions, transparency and visual quality. For PDFs, check page count, page order and orientation; interactive features and signatures may not be retained. For tables, check headers, row counts and data types: CSV and TSV values become JSON strings, and potential spreadsheet formulas receive an apostrophe prefix on export. Base64 is reversible encoding, so it does not protect secret information.
Read the step-by-step conversion guide · Privacy and analytics
Technical references
- RFC 8259: JSON format: Reference for JSON syntax and number interoperability.
Maintained by newcb23 · Content updated · Contact & feedback