The first browser-tool collection in the world to ship natively in 20 hand-translated languages — and the first to interconnect its tools as one workflow. Every output flows into compatible neighbours via a one-click Send to… button; every scenario is shareable as a plain URL; every recent input is one click away. Most tools expose configuration depth that's genuinely rare online — JWT verification across HS, RS, ES and EdDSA in one place; buy-vs-rent with full opportunity-cost modeling; recursive JSON sort with stable diff output; retirement projections that compound inflation correctly; mortgage amortization tables exportable as CSV or JSON. Security-first by design — no data stored, no requests logged, no information ever leaves your device, not even analytics. The cryptography suite runs on the native Web Crypto API. Financial charts export as PNG and their tables as CSV or JSON. The PDF toolkit processes files locally and discards them when you close the tab. Equally sharp on a phone and a desktop.

World-first: 20 native languages Outputs flow between tools Your data is never sent or stored Web Crypto API — not Math.random() Works on desktop & mobile Free · No account · No paywall · No ads

starConfiguration Depth You Won't Find Elsewhere

Most tools here expose configuration options that simply don't exist on competitor sites — full opportunity-cost modeling, signature-algorithm coverage across every standard family, deep readability metrics, recursive sort with stable diffs, FIRE-target retirement modeling. A few solve problems that are genuinely hard to find quality tools for online.

Privacy-first vpn_keyAsymmetric Key Generator

Generates RSA, ECDSA, and Ed25519 key pairs in your browser via the Web Crypto API. Your private key is computed locally and never transmitted — a standard that most online key tools simply do not meet.

 Finance real_estate_agentBuy vs Rent Calculator

A rigorous financial model that compares homeownership and renting over time — accounting for opportunity cost on the down payment, annual rent growth, home appreciation, and inflation. Charts both trajectories side by side, with every figure exportable as PNG and every year-by-year table downloadable as CSV or JSON.

 Developer text_formatVariable Naming Converter

Paste any identifier or phrase and instantly get camelCase, PascalCase, snake_case, kebab-case, SCREAMING_SNAKE_CASE, and more — all conversions at once, in one place.

 Developer timerCron Expression Parser

Paste a cron expression and get a plain-English explanation plus the next scheduled run dates. A practical sanity-check before deploying any scheduled job or automation.

 Privacy-first keySymmetric Key Generator

Generates AES and HMAC keys of any standard length using the Web Crypto API's cryptographically secure random source — the same engine browsers use for TLS. Output in hex, Base64, or raw bytes, ready to drop into real encryption workflows.

paymentsMoney

real_estate_agentBuy vs Rent Calculator Compare buying a home versus renting and investing the difference currency_exchangeCurrency Converter Convert between world currencies with live rates trending_upInvestment Calculator See how your money grows over time with compound interest account_balanceLoan Calculator Monthly payment, total interest, and amortization schedule houseMortgage Calculator Monthly payment, total interest, and year-by-year amortization elderlyRetirement / FIRE Calculator Plan retirement with compound growth, inflation, and the 4% rule savingsSavings Goal Calculator Plan how to reach your savings goal over time

codeDevelopment

enhanced_encryptionAES Text Encryption Encrypt and decrypt text with AES-256-GCM and a password vpn_keyAsymmetric Key Generator Generate RSA or EC key pairs in PEM format swap_horizBase64 Encoder/Decoder Encode text to Base64 or decode Base64 back to text paletteColor Converter Convert between HEX, RGB, and HSL with live preview timerCron Expression Parser Parse cron expressions into plain English differenceDiff Checker Compare two texts and highlight the differences fingerprintHash Calculator Calculate SHA-256, SHA-384, SHA-512, SHA-1, or MD5 hashes data_objectJSON Formatter Format, minify, sort keys, stringify, and destringify JSON verified_userJWT Decoder & Verifier Decode JWT header and payload, verify the signature client-side manage_searchRegex Tester Test regular expressions with match highlighting and capture groups format_list_numberedSequence Generator Generate numeric sequences with custom prefix, suffix, and separator keySymmetric Key Generator Generate random AES keys in hex, Base64, or raw bytes scheduleUnix Timestamp Converter Convert between Unix timestamps and human-readable dates linkURL Encoder/Decoder Encode or decode URL components tagUUID Generator Generate random UUIDs (v4) in bulk text_formatVariable Naming Converter Convert text between camelCase, snake_case, kebab-case, PascalCase, and more sync_altYAML / JSON Converter Convert between YAML and JSON formats

casinoRandom

monetization_onCoin Flip Flip a coin one or more times casinoDice Roller Roll dice of any type with statistics reorderList Randomizer Shuffle any list instantly pinRandom Number Generator Generate random numbers within a range shuffleRandom Picker Pick one or more random items from a list

handymanEveryday

monitor_weightBMI Calculator Calculate Body Mass Index with health categories contrastColor Contrast Checker Check WCAG AA/AAA color contrast for accessibility hourglass_emptyCountdown Timer Count down to any date with live updating passwordPassword Generator Generate strong, random passwords picture_as_pdfPDF Toolkit Merge, split, and rotate PDFs privately in your browser percentPercentage Calculator Calculate percentages, ratios, and percentage changes qr_codeQR Code Generator Create QR codes from text or URLs menu_bookText Readability Analyzer Score text with Flesch, Flesch-Kincaid, Gunning Fog, SMOG, and more text_fieldsWord & Character Counter Count words, characters, sentences, and estimate reading time

rocket_launchA Platform That Keeps Expanding

The toolkit is actively maintained and grows with real user needs. New tools ship on a regular cadence — built to the same standard as everything here: fully client-side, fully translated, fully responsive. Have a tool in mind that belongs in this collection? Suggest it.

add_circleSuggest a tool

All tools run entirely in your browser — on desktop and mobile. Your data is never sent to a server, never stored, never logged.