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LocalCraft

35 tools on the bench · all offline

The toolbox that never phones home.

35 tools ready today for developers and everyday work, running entirely in this tab. Everything sits in your browser — zero servers, 100% private, works offline.

100% client-side — your data never leaves your browser
Developer tools19 toolsJSON, SQL, regex, hashes, cron…Everyday tools16 toolsPDFs, images, QR, passwords, loans…

Permanent pages: /developer · /everyday

Code & data

4 tools
JSON formatterPretty-print, minify and validate JSON, with the error position called out.readyCode & data
SQL formatterReformat and indent SQL queries for your dialect.readyCode & data
YAML / JSON / CSV converterConvert structured and tabular data between YAML, JSON and CSV.readyCode & data
JSON to TypeScriptGenerate TypeScript interfaces from a JSON sample.readyCode & data

Encoding & crypto

5 tools
JWT decoderInspect the header, payload and expiry of a token — locally, obviously.readyEncoding & crypto
Base64 encoderEncode and decode text or files to Base64, straight from disk.readyEncoding & crypto
URL encoderPercent-encode or decode URLs and query strings.readyEncoding & crypto
Hash generatorMD5, SHA-1, SHA-256 and SHA-512 digests via the Web Crypto API.readyEncoding & crypto
UUID generatorBulk-generate UUID v4 and ULID identifiers with one keystroke.readyEncoding & crypto

Text & regex

4 tools
Regex testerTest regular expressions against sample text with match highlighting.readyText & regex
Diff checkerCompare two texts or code snippets side by side, line by line.readyText & regex
Case convertercamelCase, snake_case, kebab-case, PascalCase, Title Case and more.readyText & regex
Duplicate line removerDrop duplicate lines from a list, with sort and trim options.readyText & regex

Frontend & design

3 tools
Color & contrast checkerPick colors and check WCAG AA/AAA contrast ratios as you go.readyFrontend & design
Shadow & gradient generatorCompose CSS box-shadows and gradients visually, copy the CSS out.readyFrontend & design
SVG optimizerStrip metadata and round coordinates to shrink SVG files.readyFrontend & design

Time & network

3 tools
Unix timestamp converterConvert between Unix epochs and human dates, in either direction.readyTime & network
Cron explainerParse cron expressions into plain language and preview upcoming runs.readyTime & network
HTTP status lookupSearch HTTP status codes with meaning and usage notes.readyTime & network

PDF & documents

6 tools
Placeholder PDF generatorMulti-page lorem or wireframe PDFs for mockups and print tests.readyPDF & documents
Receipt & invoice generatorBuild believable sample receipts and invoices, exported as PDF.readyPDF & documents
Certificate generatorDesign completion certificates and award diplomas, exported as PDF.readyPDF & documents
PDF mergerCombine several PDFs into one, entirely on this machine.readyPDF & documents
PDF page extractorPull selected pages out of a PDF and save them as a new file.readyPDF & documents
PDF watermarkerStamp text or image watermarks across every page.readyPDF & documents

Images & media

3 tools
Image converter & resizerConvert PNG/JPG/WebP/AVIF and resize, all on the canvas API.readyImages & media
AI background removerCut subjects out of photos with an on-device AI model.readyImages & media
Media trimmer & converterTrim and convert audio/video in the browser via WebAssembly.readyImages & media

Codes & security

4 tools
QR generator & scannerMake QR codes with logo embeds, or scan them with the camera.readyCodes & security
Barcode generatorPrint UPC-A/E and Code-128 barcodes for labels and props.readyCodes & security
AES-256 encryptorPassword-encrypt files or text with AES-256-GCM, locally.readyCodes & security
Password generatorGenerate passwords and passphrases to your own entropy rules.readyCodes & security

Calculators

3 tools
Loan & mortgage calculatorAmortization schedule, totals and payoff for any loan.readyCalculators
Salary converterMove between annual, monthly, daily and hourly rates.readyCalculators
Tip & bill splitterSplit any bill with tip, per person, in two taps.readyCalculators

35 of 35 tools built · the rest are on the workbench