Local-first processing
JSON strings, tokens, markdown, and image files are processed in the browser so you can validate private work quickly.
Browser-based tools for JSON, text, tokens, and images
zzzbbb.net helps you format JSON, inspect Base64 and JWT payloads, preview Markdown, and edit images without sending your work to a server. Each tool page combines an interactive panel with plain-language explanations so you can search, understand, and run the task in one place.
Why zzzbbb.net
Search-friendly explanations
Each tool page includes practical use cases, common mistakes, and FAQ sections so searchers can act immediately after landing.
One workflow hub
Move from JSON cleanup to Base64 decoding, URL encoding, markdown preview, and image optimization without changing products.
Popular starting points
Clean up raw API JSON
Format unreadable response payloads into reviewable JSON blocks.
Decode Base64 and JWT fragments
Inspect token payloads, Base64URL fragments, and padding issues without leaving the browser.
Crop and optimize images locally
Preview an image on-screen, crop the needed area, then resize or compress it for upload.
Preview docs before publishing
Render Markdown safely and verify lists, code blocks, and headings before sharing.
All Tools
Encoding and Security
Base64 Encode/Decode
Encode or decode text with Base64.
Image Tools
Image Compressor
Reduce image file size by changing quality and output settings.
Image Tools
Image Cropper
Crop an image to the exact area you need.
Image Tools
Image Format Converter
Convert images between JPG, PNG, and WebP.
Image Tools
Image Resizer
Resize image dimensions for web publishing and asset prep.
Developer Data
JSON Beautifier
Format compressed JSON into an easy-to-read structure.
Developer Data
JSON Minifier
Remove whitespace from JSON to create a compact payload.
Developer Data
JSON to YAML
Convert JSON documents into clean YAML.
Developer Data
JSON Validator
Check whether a JSON payload is valid and inspect the parsed result.
Encoding and Security
JWT Decoder
Decode JWT header and payload data into readable JSON.
Productivity
Markdown Preview
Render Markdown into a safe HTML preview in real time.
Encoding and Security
Regex Tester
Test a regular expression and review match results instantly.
Productivity
Slugify
Turn a sentence into a URL-friendly slug.
Encoding and Security
URL Encode/Decode
Encode or decode URL components safely.
Developer Data
YAML to JSON
Convert YAML documents into JSON.
Browse by Category
Developer Data
Tools for JSON cleanup, structured data inspection, token decoding, and API debugging.
Tools: 5
Encoding and Security
Utilities for Base64, URLs, JWT inspection, and safe browser-side debugging workflows.
Tools: 4
Image Tools
Crop, resize, compress, and convert images locally in the browser.
Tools: 4
Productivity
Text and Markdown helpers for day-to-day writing, slug generation, and formatting work.
Tools: 2