About DevToolsForYou

What is DevToolsForYou?

DevToolsForYou is a free collection of focused, browser-based utilities built for developers. Each tool lives on its own dedicated page so you can bookmark it, share it with teammates, and get straight to work without wading through an all-in-one Swiss Army knife interface.

The site currently offers 55 tools covering the tasks developers reach for most often — encoding, decoding, formatting, hashing, converting, and inspecting.

Available tools

• Base64 Encoder and Decoder — Encode text to Base64 or decode Base64 back into readable text with Unicode-safe support.
• URL Encoder and Decoder — Encode or decode URLs, query strings, and parameter values for safe transport across the web.
• JSON Formatter, Minifier, and Validator — Format, minify, and validate JSON payloads.
• Unix Timestamp Converter — Convert Unix time to readable date formats and back.
• JWT Encoder and Decoder — Decode JWTs and generate signed or unsigned tokens in the browser.
• Hash Generator — Generate MD5, SHA-1, SHA-256, and SHA-512 hashes from text input.
• HTML Escape Tool — Escape and unescape HTML entities for safe display in code, templates, and content.
• Word Counter — Count words, characters, sentences, paragraphs, and estimated reading time for any block of text.
• Byte Size Counter — Calculate the exact byte size of any text in UTF-8 encoding, shown in bytes, KB, and MB.
• Regex Tester — Test regular expressions against any string with live match highlighting, capture groups, and flag controls.
• Diff Checker — Paste two texts and instantly see line-by-line differences with added, removed, and unchanged lines highlighted.
• Timezone Converter — Convert any date and time between world timezones with automatic daylight saving time awareness.
• Number to Words Converter — Convert numbers to English words and English words back to numbers instantly.
• Unit Converter — Convert between units of length, weight, temperature, volume, speed, and area instantly.
• Currency Converter — Convert between 30+ currencies with live exchange rates updated daily.
• Color Picker and Hex Generator — Pick any color and instantly get its HEX, RGB, and HSL values — with one-click copy for each format.
• Age Calculator — Calculate exact age from a date of birth — in years, months, weeks, days, hours, and minutes.
• Retirement Calculator — Enter your date of birth to find out when you will retire at ages 40, 45, 50, 55, 58, and 60 — with exact dates and countdowns.
• Case Converter — Convert text between lowercase, uppercase, title case, sentence case, camelCase, snake_case, and kebab-case.
• Roman Numeral Converter — Convert between Arabic numbers and Roman numerals instantly — supports 1 to 3999.
• UUID Generator — Generate UUIDs v1 (time-based) and v4 (random) — single or in bulk, copy with one click.
• QR Code Generator — Generate a QR code from any text, URL, email, or phone number — download it as a PNG instantly, no account needed.
• Lorem Ipsum Generator — Generate lorem ipsum placeholder text by words, sentences, or paragraphs — copy it instantly for mockups, wireframes, and designs.
• Duplicate Line Remover — Paste any text and instantly remove duplicate lines — with options for case sensitivity, whitespace trimming, and sorted output.
• Text Sorter — Sort lines of text alphabetically, numerically, or in reverse — with options for case sensitivity and duplicate removal.
• String Escape Tool — Escape and unescape strings for JSON, SQL, JavaScript, and Regex — instantly in your browser.
• JSON ↔ CSV Converter — Convert JSON arrays to CSV spreadsheets and CSV data back to JSON arrays — instantly in your browser.
• Cron Expression Builder & Parser — Build, parse, and validate cron expressions visually. See the human-readable schedule and upcoming run times instantly.
• Percentage Calculator — Calculate percentages instantly — X% of Y, what percentage X is of Y, percentage change, and add/subtract a percentage.
• JSON ↔ YAML Converter — Convert JSON to YAML and YAML back to JSON — perfect for Kubernetes, Docker Compose, GitHub Actions, and any config-heavy workflow.
• JSON to Code Generator — Convert any JSON object into typed code — TypeScript interfaces, Python dataclasses, Go structs, Rust structs, Java records, and Zod schemas.
• Binary / Hex / Octal Converter — Convert numbers between binary, octal, decimal, and hexadecimal instantly — see all four bases at once.
• Hindi Numeral Converter — Convert between Hindi (Devanagari) numerals and English (Arabic) numerals instantly.
• Password Generator — Generate secure random passwords with configurable length, character sets, and a built-in strength indicator.
• Password Strength Checker — Check password strength with entropy calculation, character composition analysis, and estimated crack times at different attack speeds.
• HTTP Request Builder — Build, send, and inspect HTTP requests with custom headers, query params, and body — all in your browser.
• IP Address Lookup — Look up geolocation, ISP, ASN, and network details for any IP address or domain — or detect your own IP instantly.
• DNS Lookup — Query DNS records for any domain — A, AAAA, MX, TXT, NS, CNAME, SOA, CAA, PTR, or all at once.
• WHOIS Lookup — Look up registration details, ownership, nameservers, and expiry for any domain, IP address, or ASN.
• DNS Propagation Checker — Check whether your DNS change has propagated across 10 global resolvers — see which ones have updated and which still serve the old record.
• MX Record Checker — Check MX records, SPF, DMARC, and DKIM configuration for any domain — with an email security score.
• SSL Certificate Checker — Inspect the full SSL/TLS certificate chain for any domain — validity, expiry, issuer, SANs, fingerprints, and key details.
• IP Blacklist Checker — Check whether an IPv4 address is listed on any of 17 DNS-based blacklists used by spam filters and firewalls worldwide.
• SQL EXPLAIN Plan Viewer — Paste a PostgreSQL EXPLAIN output and visualize the query execution plan as a colour-coded, annotated tree with cost estimates and row counts.
• SQL EXPLAIN ANALYZE Analyzer — Paste a PostgreSQL EXPLAIN ANALYZE output to profile query performance, flag slow nodes, and identify row estimation mismatches that cause bad plans.
• JSON Diff Checker — Compare two JSON objects semantically. See exactly which keys were added, removed, or changed at any depth — with dot-notation paths and old/new values.
• Dockerfile Validator — Paste a Dockerfile and get instant lint feedback: unknown instructions, unpinned tags, apt-get anti-patterns, missing USER, shell-form CMD/ENTRYPOINT, and more.
• Email and URL Extractor — Paste any text and instantly extract all email addresses and URLs. Results are deduplicated, sorted, and copyable one at a time or all at once.
• CSV and Excel Viewer — View, sort, and search CSV, TSV, and Excel files in the browser. Paste text or upload a file — no signup, no server, no spreadsheet app needed.
• HTTP Request Replay — Paste a curl command or raw HTTP request, edit any field, and replay it instantly. Supports all common curl flags, multi-line commands, and raw HTTP request format.
• cURL to Code Converter — Convert any curl command into runnable code in JavaScript, Python, PHP, Go, Ruby, or Java — no signup required, all processing in the browser.
• Base64 File Encoder / Decoder — Encode any file or text to Base64, or decode Base64 back to its original form. Supports images, PDFs, certificates, and any binary file — fully in-browser.
• JSON to TypeScript Interface — Convert any JSON object to TypeScript interfaces instantly. Handles nested objects, arrays, nullable values, and union types. All in your browser.
• Regex Generator — Build regular expressions from common presets or write your own, then test them live against sample strings with inline match highlighting. Flags, capture groups, and copy support included.
• JWT Expiry Visual Timeline — Paste a JWT and see its lifecycle on a visual timeline — issued, not-before, expiry, and current time. All claims decoded inline, status shown at a glance.

How it works

Every transformation runs entirely inside your browser using standard web APIs and JavaScript. When you paste a value and trigger a tool, the result is computed locally and displayed on the page. Nothing you type or paste is sent to any server.

There are no accounts, no subscriptions, no paywalls, and no third-party tracking scripts. Open a tool, use it, and go.

Why dedicated pages?

Most developer utility sites cram every tool onto a single page with tabs or a sidebar. That works, but it means every tool shares the same URL, making bookmarks useless and sharing awkward.

DevToolsForYou gives every tool its own clean URL — e.g. /base64-encoder-decoder, /json-formatter, /epoch-unix-converter — so links are shareable, bookmarks are meaningful, and each workspace stays focused on a single task.

Privacy

No data you enter into any tool is collected, logged, or stored. See the full Privacy Policy for details.

Contact

Questions, feedback, or tool requests can be sent to hello@devtoolsforyou.com.