JSON Formatter
Format, validate and beautify JSON in your browser — no upload.
Online editor
Data & Text Tools
Format and validate JSON, encode or decode Base64 with full UTF-8 support, and convert YAML to Java .properties and back. All processing happens locally in your browser, so config files, API payloads and internal data are never transmitted to a server.
Quick answer
Free online tools for JSON, Base64 and YAML/.properties that format, validate, encode and convert text entirely in your browser — nothing you paste is uploaded or stored.
- 100% in-browser
- Nothing uploaded
- No sign-up
- Copy or download
- JSON · Base64 · YAML
3 free data & text tools
Pick a tool and start in seconds.
Base64 Encoder / Decoder
Encode text to Base64 or decode it back — UTF-8 safe, no upload.
Online editor
Properties to YAML Converter
Convert Java .properties to YAML (and back) — Spring Boot friendly, no upload.
Online editor
Nothing is uploaded. Every tool on this page runs locally in your browser using the Canvas API, Web Workers and WebAssembly codecs. Your files are never sent to a server, and there is no registration, watermark or daily limit.
Which data & text tools should you use?
All 3 tools are free and process files on your device.
| Tool | Converts | Best for |
|---|---|---|
| JSON Formatter | JSON → formatted / minified JSON | Making API responses and config files readable, and checking their syntax |
| Base64 Encoder / Decoder | TEXT → BASE64 | Data URLs, email attachments, and API payloads |
| Properties to YAML Converter | YAML → PROPERTIES | Converting Java .properties to YAML (and back) for Spring Boot |
Frequently Asked Questions
Is my data safe when I paste it into these tools?
Yes. Formatting, encoding and conversion all happen locally in your browser. Nothing you paste is transmitted to, or stored on, any server — there is no backend involved in the processing at all.
Do these tools keep working after the page loads?
Once the page has loaded, every operation runs locally in your browser. No text or file is uploaded at any point, and the result is available instantly via Copy or Download.
What can the JSON formatter do?
It beautifies JSON with 2, 4 or 8 space indentation, minifies it, validates it with a clear error message, shows an expandable tree view, and lets you copy the result or download it as a .json file.
Does the Base64 tool support Unicode and emoji?
Yes. Text is encoded and decoded as UTF-8, so Chinese, Japanese, Arabic, emoji and other non-Latin characters round-trip correctly in both directions.
How does the YAML to Properties converter handle nested keys and comments?
Nested keys are flattened with dot notation (for example server.port=8080) and rebuilt into a nested structure when converting back. Comments are preserved and attached to the key they precede; blank lines and column alignment are not kept.