SSH / KEYS
PPK to OpenSSH Converter
Convert private keys between PuTTY .ppk, OpenSSH and legacy PEM formats — both directions, encrypted keys supported. Your key never leaves your browser.
Open the toolFree tools
Small tools that run entirely in your browser.
Utilities for everyday engineering work. No accounts, no uploads — every tool converts, checks or formats data on your own device.
Showing 27 of 27 tools
SSH / KEYGEN
SSH Key Generator
Generate fresh Ed25519, RSA or ECDSA keypairs with your browser's audited crypto, emitted as OpenSSH. Your key never leaves your browser.
Open the toolPPK / KEYGEN
PPK Generator
Generate fresh PuTTY .ppk key files with selectable version and passphrase protection. Your key never leaves your browser.
Open the toolIP / CIDR
IP CIDR Calculator
Subnet math for IPv4 and IPv6: ranges, usable hosts, membership checks and subnet splitting. Everything computes on your device.
Open the toolPASSWORD / STRENGTH
Password Strength Calculator
Entropy, complexity rating and brute-force crack-time estimates across attacker hardware. Nothing is uploaded anywhere.
Open the toolBARCODE / GENERATE
Barcode Generator
Generate EAN, UPC, ISBN, GS1 DataBar, Code 128, Code 39, Telepen and more 1D codes — validated and scan-verified in your browser.
Open the tool2D CODE / GENERATE
2D Code Generator
Generate QR, Data Matrix, Aztec, PDF417 and MaxiCode with error-correction, color and frame controls — validated and scan-verified in your browser.
Open the toolQR / GENERATE
QR Code Generator
Build scannable QR codes with tunable error correction, version and styling, plus a full technical readout. Everything renders in your browser.
Open the toolQR / SCAN
QR Code Reader & Scanner
Decode QR codes from an uploaded image or your camera, with image stats, symbol details and raw payload data. Nothing is uploaded anywhere.
Open the toolBARCODE / SCAN
Barcode Reader & Scanner
Decode 1D, 2D and postal barcodes from an uploaded image or your camera, with honest format and profile details. Nothing is uploaded anywhere.
Open the toolDATA / COMPRESS
Compression Comparison
Race RLE, Huffman, LZW, LZ78, LZ77, a gzip-style pipeline and real zlib, raw DEFLATE, gzip and Brotli across data types, lengths and your own text — every byte compressed in your browser.
Open the toolFLOW / CONVERT
Flow Converter
Convert gas flow between actual, normal, standard and custom reference conditions with mixed temperature, pressure, volume and time units — ideal, Standing–Katz or custom Z. Everything computes in your browser.
Open the toolPASSWORD / GENERATE
Password Generator
Generate random passwords or memorable EFF-wordlist passphrases with live entropy ratings, drawn with your browser's secure generator. Nothing is stored or uploaded anywhere.
Open the toolDATA / JSON
JSON Formatter
Format, validate and minify JSON with line-and-column errors, key sorting and document stats. Everything computes in your browser.
Open the toolDATA / CODEC
Base64 Codec
Encode and decode standard and URL-safe Base64 plus URL percent-encoding, converted as you type. Everything computes in your browser.
Open the toolJWT / DECODE
JWT Decoder
Decode token headers, payloads and expiry status with explicit never-verified signatures. Everything computes in your browser.
Open the toolIMAGE / COMPRESS
Image Compressor
Shrink photos with quality and resize controls, before/after stats and download. Everything computes in your browser.
Open the toolIMAGE / CONVERT
Image Converter
Switch photos between JPEG, PNG and WebP at full dimensions with quality control. Everything computes in your browser.
Open the toolPDF / MERGE
PDF Merge
Order PDFs, preview page counts and combine them into one document with a download. Everything computes in your browser.
Open the toolUNITS / CONVERT
Unit Converter
Convert length, mass, volume, pressure and temperature with exact factors and live rates. Everything computes in your browser.
Open the toolFLOW / CV
Valve Cv Estimator
Size Cv/Kv, predict pressure drop or flow for liquids per IEC 60534 with mixed units. Everything computes in your browser.
Open the toolDATA / UUID
UUID Generator
Generate bulk v4 or time-ordered v7 UUIDs in five formats, plus version validation. Everything computes in your browser.
Open the toolLOAN / EMI
EMI Calculator
Compute loan EMI with a principal-versus-interest donut and year-by-year amortization. Everything computes in your browser.
Open the toolVDA 4994 / LABEL
VDA 4994 Shipping Label Generator
Generate VDA 4994 Single, Master and Mixed transport labels with ZF LIFETEC preset — validated and scan-verified in your browser.
Open the toolVDA 4902 / LABEL
VDA 4902 Goods Tag Generator
Generate VDA 4902 V4 A5, KLT and steel goods tags with multilingual titles, ordered Data Matrix data and a Mod-43 check value.
Open the toolVDA 4992 / MAT
VDA 4992 MAT Label Generator
Generate size-aware VDA 4992 MAT labels for 78×45 mm and 50×20 mm material packages with validated Data Matrix data.
Open the toolPOSTAL / GENERATE
Postal Barcode Generator
Generate USPS, Royal Mail, PostNL, Deutsche Post, AusPost and Japan Post barcodes — validated in your browser.
Open the toolMore soon
New tools on the way.
This series grows with the formats and checks engineering teams ask about most. Suggest one through the contact page.
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