Document & Developer Tools in Document & Developer Tools

Simple browser tools for files, structured data, encoding and everyday text work.

File and Code Compare Tool

Compare two uploaded text files or code snippets and highlight changed, added and removed lines.

HTML Entity Encoder and Decoder in Document & Developer Tools

Encode HTML special characters into entities or decode entities back to readable text in your browser.

XML Formatter and Validator in Document & Developer Tools

Format and validate XML in your browser with readable indentation and parser error feedback.

Unix Timestamp Converter in Document & Developer Tools

Convert Unix timestamps in seconds or milliseconds to local and UTC date-time values, or convert a date back to Unix time. On Document & Developer Tools, read this point in the context of developer and web-tool use, because the same advice can mean something different when the inputs, units and final decision change.

Query String Parser and Builder in Document & Developer Tools

Parse URL query parameters into a readable table and rebuild a properly encoded query string in your browser. For Document & Developer Tools, the useful check is to compare the result with the exact source values used on this page instead of copying a general rule.

SHA-256 Hash Generator in Document & Developer Tools

Generate a SHA-256 digest from text directly in your browser and copy the hexadecimal hash for verification tasks. In this developer and web-tool use page, keep the page title beside the result so the number is not separated from the assumption that created it.

Image to PDF Converter in Document & Developer Tools

Convert JPG, PNG and WebP images into a downloadable PDF directly in your browser.

JSON Formatter and Validator in Document & Developer Tools

Format, minify and validate JSON with readable error messages.

CSV to JSON Converter in Document & Developer Tools

Convert comma-separated tabular data into a JSON array in the browser.

Base64 Encoder and Decoder in Document & Developer Tools

Encode plain text to Base64 or decode Base64 back to readable UTF-8 text.

URL Encoder and Decoder in Document & Developer Tools

Encode URL components safely or decode percent-encoded text.

UUID Generator in Document & Developer Tools

Generate random UUID version 4 identifiers in your browser.

Text Case Converter in Document & Developer Tools

Convert text to uppercase, lowercase, title case or sentence case.

Word and Character Counter in Document & Developer Tools

Count words, characters, sentences, paragraphs and estimated reading time.

JWT Decoder in Document & Developer Tools

Decode JWT headers and payload claims locally. This jwt decoder in document & developer tools note explains the basic purpose, but you should open the page, check the input labels and review the result before using it for planning.

JSON to CSV Converter in Document & Developer Tools

Convert JSON objects into escaped CSV records. This json to csv converter in document & developer tools note explains the basic purpose, but you should open the page, check the input labels and review the result before using it for planning.

CSV Table Viewer in Document & Developer Tools

Parse CSV into a responsive table. This csv table viewer in document & developer tools note explains the basic purpose, but you should open the page, check the input labels and review the result before using it for planning.

Regular Expression Tester in Document & Developer Tools

Test patterns, flags, matches and capture groups. This regular expression tester in document & developer tools note explains the basic purpose, but you should open the page, check the input labels and review the result before using it for planning.

Text Diff Checker in Document & Developer Tools

Highlight text additions and removals. This text diff checker in document & developer tools note explains the basic purpose, but you should open the page, check the input labels and review the result before using it for planning.

HTML Formatter in Document & Developer Tools

Indent HTML for easier review. This html formatter in document & developer tools note explains the basic purpose, but you should open the page, check the input labels and review the result before using it for planning.

CSS Minifier in Document & Developer Tools

Remove comments and unnecessary spacing. This css minifier in document & developer tools note explains the basic purpose, but you should open the page, check the input labels and review the result before using it for planning.

JavaScript Minifier in Document & Developer Tools

Minify JavaScript with Terser. This javascript minifier in document & developer tools note explains the basic purpose, but you should open the page, check the input labels and review the result before using it for planning.

Markdown Previewer in Document & Developer Tools

Render sanitized Markdown and generated HTML. This markdown previewer in document & developer tools note explains the basic purpose, but you should open the page, check the input labels and review the result before using it for planning.

HEX RGB HSL Converter

Convert colours with a live swatch. This hex rgb hsl converter note explains the basic purpose, but you should open the page, check the input labels and review the result before using it for planning.

HMAC Generator in Document & Developer Tools

Create HMAC-SHA test digests. This hmac generator in document & developer tools note explains the basic purpose, but you should open the page, check the input labels and review the result before using it for planning.

Number Base Converter in Document & Developer Tools

Convert binary, octal, decimal and hexadecimal. This number base converter in document & developer tools note explains the basic purpose, but you should open the page, check the input labels and review the result before using it for planning.

URL Parser in Document & Developer Tools

Inspect every major URL component. This url parser in document & developer tools note explains the basic purpose, but you should open the page, check the input labels and review the result before using it for planning.

HTTP Status Lookup

Look up common HTTP response codes. This http status lookup note explains the basic purpose, but you should open the page, check the input labels and review the result before using it for planning.

MIME Type Lookup in Document & Developer Tools

Find common MIME types and extensions. This mime type lookup in document & developer tools note explains the basic purpose, but you should open the page, check the input labels and review the result before using it for planning.

User Agent Parser in Document & Developer Tools

Inspect browser, OS and device details. This user agent parser in document & developer tools note explains the basic purpose, but you should open the page, check the input labels and review the result before using it for planning.

PX to REM Converter in Document & Developer Tools

Convert CSS units using a root size. This px to rem converter in document & developer tools note explains the basic purpose, but you should open the page, check the input labels and review the result before using it for planning.

Aspect Ratio Calculator in Document & Developer Tools

Simplify and scale dimensions. This aspect ratio calculator in document & developer tools note explains the basic purpose, but you should open the page, check the input labels and review the result before using it for planning.

Sort and Deduplicate Text

Clean and sort unique lines. This sort and deduplicate text note explains the basic purpose, but you should open the page, check the input labels and review the result before using it for planning.

URL Slug Generator in Document & Developer Tools

Create lowercase hyphenated slugs. This url slug generator in document & developer tools note explains the basic purpose, but you should open the page, check the input labels and review the result before using it for planning.

Web Tools guides

Learn how to prepare structured data before using browser tools.

Simple tools without extra steps

Use these utilities when you need to format JSON, convert CSV, create a PDF from images, encode text or prepare content for software and documents. Each tool works directly on its page and includes practical limitations and privacy notes.

Keep original files and review generated output before using it in production systems or formal documents.

Practical notes for Document & Developer Tools

Document & Developer Tools should be read as a developer utility with visible assumptions. Start with the exact sample input from your own record and compare it with the label beside the input field. If the value came from a bill, file, worksheet, statement, app screen or handwritten note, copy it carefully before changing any other setting.

Document & Developer Tools becomes more useful when you run a second scenario after the first result. Change only the output format or the validation result and keep the remaining inputs unchanged. This shows whether the final browser workflow is stable or whether one small assumption moves the answer enough to matter.

Example workflow for Document & Developer Tools

Document & Developer Tools works best with a simple workflow: collect the source value, enter the main input, check the supporting input, calculate, then compare the answer with a rough expectation. If the answer looks surprising, review decimal points, percentage style, file format, date order, unit conversion and rounding before using the result.

Document & Developer Tools results are easier to reuse when the copy step is written beside the answer. A saved number without context is easy to misunderstand later. A saved number with the original source, date, unit and assumption can be compared with future calculations or official documents.

Common mistakes to avoid in Document & Developer Tools

Using an old sample input when a current value is available.
Mixing the output format from one situation with the validation result from another.
Changing several inputs at once and losing track of the cause.
Ignoring the formula, rounding note or limitation written on the page.
Treating Document & Developer Tools as final advice instead of a practical estimate.

Helpful FAQs for Document & Developer Tools

How should I check the Document & Developer Tools result?

For Document & Developer Tools, compare the answer with your source value, the page formula and one alternate scenario. If the alternate scenario changes the result strongly, review that exact input before relying on the number.

Why can Document & Developer Tools differ from another source?

Document & Developer Tools can differ when another source uses a different rounding method, input period, unit conversion, eligibility rule, file interpretation or default assumption. Compare the method before comparing only the final answer.

Can I use Document & Developer Tools for an important decision?

Use Document & Developer Tools for planning, learning and checking. If the result affects official paperwork, tax, money, health, legal work, school records or business reporting, verify it with the relevant source.