All Developer Tools– Choose Formatting, Encoding, PDF, Security & Text Utilities

Browse a curated, no-upload set of browser-based tools for JSON formatting, Base64 and URL encoding, hashes, JWTs, UUIDs, QR codes, CSV/JSON, PDFs, security checks, and text cleanup
— compare focused category guides before opening the exact utility you need.

12 tools
6 categories

Popular Tools

Start with the highest-intent tools for formatting, encoding, authentication, PDFs, and data conversion.

Choose the right tool by task

Use this guide when the search intent is clear: formatting, encoding, PDFs, security checks, or text cleanup.

PDF Tools for Local File Conversion

Merge, split, convert, and manage PDF files directly in the browser without uploading documents.

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Best for

PDF Merge

Use it to combine several PDFs into one ordered document.

Recommended flow

Prepare a document submission package

Security and Authentication Tools

Inspect security headers, CSP rules, authentication data, JWT claims, and password strength with local browser tools.

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Best for

Security Headers Checker

Use it before launch to review HSTS, CSP, nosniff, frame protection, referrer policy, and permissions policy headers.

Recommended flow

Review launch security headers

Text Cleanup and Editing Tools

Clean copied text, remove line numbers, delete blank rows, deduplicate lists, compare drafts, and prepare plain text for sharing.

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Best for

Word Counter

Use it to count words, characters, sentences, and reading time.

Recommended flow

Clean copied code or PDF excerpts

Workflow guides for common jobs

Read the workflow first when you need a repeatable path for debugging payloads, auth tokens, PDFs, checksums, and data conversion.

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Format JSON for API debugging

Learn how to format, validate, and inspect API JSON responses so missing commas, wrong nesting, and invalid payloads are easier to find.

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Decode a JWT safely before debugging authentication

Learn how to inspect JWT headers and payload claims without treating decoded tokens as verified or sharing secrets by accident.

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Base64 decode an API payload

Learn how to decode Base64 API fields, inspect UTF-8 text safely, and avoid confusing encoding with encryption.

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Convert CSV to JSON for spreadsheet data cleanup

Learn how to convert spreadsheet CSV exports into JSON while checking headers, delimiters, empty cells, and nested-looking values.

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Fix CSV and JSON conversion errors

Diagnose CSV to JSON and JSON to CSV conversion problems caused by headers, quoted commas, delimiters, empty cells, encoding, and malformed JSON.

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Verify a file checksum with SHA-256

Learn how to compare SHA-256 checksums before trusting a downloaded file, release archive, backup, or shared installer.

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Encode URL query parameters safely

Learn how to percent-encode query parameters so spaces, ampersands, redirects, and Unicode text do not break a URL.

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Generate UUIDs for realistic test data

Learn when to use random UUIDs for fixtures, mock API payloads, database seed rows, and repeatable local testing.

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Create a QR code for any link

Learn how to create a QR code for a website, form, menu, event page, or support link without making it hard to scan.

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Inspect HTTP response headers before debugging APIs

Learn how to capture and inspect response headers from curl, browser DevTools, API clients, or CDN logs before changing cache, CORS, or security settings.

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Remove line numbers from copied text

Clean copied code, PDF excerpts, transcripts, legal text, and numbered lists by stripping line numbers while preserving dates, IDs, and inline values.

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Detect text file encoding before import

Check file encoding and BOM details before importing CSVs, logs, source files, or multilingual exports into spreadsheets, databases, and ETL jobs.

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Browse Tool Categories

Use these category hubs to compare related tools and choose the right one for the job.

PDF Tools for Local File Conversion

These PDF tools are built for quick document cleanup: combine files, convert images, extract pages, and prepare documents while keeping file processing local.

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New Tools1

Encoding5

Converter2

Formatting2

Security1

QR Code1

Text1

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