local-only
● 100% Client-Side Engine

Local-first developer utilities.

A clean, unified toolbox for formatting, inspecting, generating, and converting. Every tool runs directly inside your browser. No files or inputs ever leave your device.

⌕

Debug

Inspect, format and troubleshoot live data.
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JSON Formatter{ }
Format, validate and minify JSON with a collapsible tree.
Regex Tester.*
Test regular expressions live with match highlighting.
JWT Decoderjwt
Decode JWT header, payload and signature locally.
Cron Parsercron
Parse cron expressions and preview next run times.
HTTP Status Codeshttp
Look up any HTTP status code and its meaning.
Timestamp Convertertime
Convert Unix timestamps to readable dates and back.
JSON Diffdiff
Compare two JSON documents and highlight differences.
Log Toolslog
Filter, tail and slice log files instantly.

Utilities

Encoding, hashing, and low-level helpers.
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Base64 Encode / Decodeb64
Encode and decode Base64 text with URL-safe option.
URL Encode / Decode%20
Percent-encode or decode URL components.
Hash Generator#sha
Generate MD5, SHA-1, SHA-256, SHA-512 hashes.
UUID Generatoruuid
Generate v4 UUIDs in bulk.
HTML Entities Converter&
Escape and unescape HTML entities safely.
Text ⇄ Binary / Hex0101
Convert text to binary, hex and decimal — and back.

Text

Diffing, line cleanup, typography, and counters.
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Word Counter123
Count words, characters, sentences and reading time.
Case ConverteraA
Convert text to camelCase, snake_case, kebab-case and more.
Text Diff+/-
Compare two texts and highlight added/removed lines.
Remove Duplicate Linesuniq
Deduplicate, sort and clean line lists.
Lorem Ipsum Generatortxt
Generate placeholder text for mockups and designs.
Markdown Preview.md
Write Markdown and preview rendered HTML live.
Slug / URL Generatorslug
Turn any title into a URL-friendly slug.
Text Repeater×n
Repeat text with a custom separator.

Data & Formats

Convert, validate, and serialize between data models.
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CSV ⇄ JSONcsv
Convert CSV to JSON and JSON to CSV.
Number Base Converter0x
Convert between binary, octal, decimal and hex.
Color Converter#hex
Convert HEX, RGB, HSL and HSV values.
XML Formatter<xml>
Format and minify XML documents.
HTML / JS Sandboxrun
Run HTML, CSS and JS in a safe sandboxed preview.
YAML ⇄ JSONyml
Convert YAML to JSON and JSON to YAML.

Images

In-browser compression, cropping, resizing, and inspection.
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Image Compressorcmp
Compress JPEG, PNG and WebP without uploading.
Image Resizerdim
Resize images by pixels or percentage, keep aspect.
Image Croppercrop
Crop images with preset aspect ratios.
Image Convertercnv
Convert between PNG, JPEG, WebP, GIF and more.
Image → Data URIuri
Embed images as Base64 data URIs.
Thumbnail Makerthm
Make YouTube/social thumbnails at exact sizes.
Image Inspectormeta
Inspect dimensions, size, type and EXIF of any image.

Generators

QR codes, cryptographic passwords, gradients, and assets.
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QR Code Generatorqr
Generate QR codes for URLs, text, Wi-Fi and more.
Password Generatorpwd
Generate cryptographically secure passwords.
Gradient Generatorgrad
Design CSS gradients with a live preview.
Color Palette Generatorplt
Generate harmonious palettes from a base color.
Barcode Generatorcode
Generate Code 128 barcodes as SVG/PNG.
Random Pickerrand
Pick random items, flip coins and roll dice.
Placeholder Imagesvg
Generate placeholder images with custom text.

Media

Screen capture, video conversion, and subtitle workflows.
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Screen Recorderrec
Record your screen or a tab — stays on your device.
Video to GIFgif
Convert video clips to GIF animations.
Contact Sheet / Mosaicgrid
Combine many images into a grid sheet.
Camera Photoboothcam
Snap photos with your webcam, download locally.
SRT Subtitle Generatorsrt
Create .srt subtitles from a script with timing.
Mic & Camera Testmic
Test your microphone and camera before a call.

Calculators

Time, transfer duration, differences, and sizing.
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Percentage Calculator%
Three-in-one percentage math.
Age Calculatorage
Exact age in years, months and days.
Date Differencedays
Days, weeks and business days between dates.
Discount Calculatorsale
Sale prices, savings and final totals.
File Transfer Timembps
How long will a transfer take at your speed?
BMI Calculatorbmi
Body Mass Index with WHO categories.

Inspection & Security

Entropy analysis, URL dissection, contrast, and device info.
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Password Strength Testerzxcv
Score passwords and see how to improve them.
URL Parserurl
Break any URL into its components.
Contrast Checkerwcag
WCAG contrast ratios for accessible colors.
QR / Barcode Scannerscan
Scan QR codes from a file or webcam — locally.
Device & Browser Infoenv
See your browser, screen, language and more.

🔒 Built for Compliance & Confidentiality

Developers at banks, healthcare organizations, and high-security startups can safely debug production JWTs, format customer JSON exports, and calculate checksums without violating SOC2, HIPAA, or GDPR compliance rules.

⚡ Zero Server Latency

By running directly in your browser on device hardware, tools execute instantaneously with zero network roundtrip latency or cloud queue wait times.

Frequently Asked Questions

How does debug.tools guarantee complete privacy?

Every tool runs 100% client-side in your web browser using HTML5 Canvas, Web Audio, Web Crypto, and JavaScript parsers. Your files, code, credentials, and tokens are never uploaded or transmitted to any server.

Are these tools free to use for commercial projects?

Yes, 100% free with no limits, accounts, or subscriptions. You can use them for personal, open-source, or commercial enterprise work.

Can debug.tools be used offline?

Yes. Once cached by your browser, the tools operate offline without needing an active internet connection.

Why choose client-side tools over cloud-based utilities?

Cloud-based converters and formatters log requests, exposing sensitive database schemas, bearer tokens, and proprietary logs in server monitoring or analytics. In-browser utilities eliminate data leakage risks completely.