Everyday utilities. Sign in only where it matters.
The tools below marked Sign in required authenticate you through Si-des Auth — a standalone OAuth 2.0 / OpenID Connect identity provider running as a completely separate application. Clicking one redirects you there and back.
Everyday Utilities
QR Code Generator
Turn any text or URL into a downloadable QR code.
Barcode Generator
Generate a scannable Code128 barcode from text.
Password Generator
Cryptographically random passwords and passphrases.
Text Utilities
Base64/URL encode-decode, JSON formatter, hash calculator.
Network Speed Test
Measure your download and upload throughput.
Calculator
Standard and scientific calculator — sin/cos/tan, log, square roots, and more.
Percentage Calculator
"X% of Y", "X is what % of Y", and percentage increase/decrease.
BMI Calculator
Body Mass Index from height and weight, metric or imperial.
Age Calculator
Exact age in years, months, and days from a birth date.
Unit Converter
Length, weight, and temperature conversions.
Tip Calculator
Bill total, tip percentage, and splitting across a group.
Loan / EMI Calculator
Monthly payment and total interest for a fixed-rate loan.
Number Base Converter
Convert live between binary, octal, decimal, and hexadecimal.
Word Counter
Words, characters, sentences, paragraphs, and estimated reading time.
Color Picker & Palette Generator
Pick a color, generate tints/shades/complements, and check WCAG contrast.
Timestamp & Timezone Converter
Unix timestamp to date, and a date/time across every timezone.
Regex Tester
Live match and capture-group highlighting against sample text.
CSV ⇄ JSON Converter
Convert between CSV and JSON, with proper quoted-field handling.
UUID / Random Generator
UUIDv4, random hex strings, dice rolls, and coin flips.
Text Diff Checker
Line-level diff between two blocks of text.
Markdown Live Previewer
Side-by-side Markdown editor and live preview.
JWT Decoder
Decode a JWT’s header and payload, and optionally verify an HMAC signature.
URL Shortener
Stateless, database-free short links — the destination is encoded directly into the link.
Privacy & Security
My Internet Profile
See what a website can see about your connection and browser, plus common privacy leaks.
URL Safety Inspector
Check a link for common phishing red flags before you click it.
Steganography
Hide (and reveal) a secret message inside a PNG image.
Steganalysis Lab
Chi-Square LSB detection and an EOF/metadata inspector for a suspect image.
Local Share
Send files and messages directly between two devices, peer-to-peer — no server in the middle.
PDF Toolkit
Document Converter
Convert images between formats, or turn text/Markdown, Word, or Excel files into a PDF.
Organize PDF
Merge, split, extract, remove, rotate, reorder, or crop pages.
Compress PDF
Shrink a scanned or image-heavy PDF by re-rendering it at a lower quality.
Images to PDF
Combine JPG/PNG images into one multi-page PDF.
PDF to Images
Render every page of a PDF as a downloadable PNG or JPEG.
PDF to Text
Extract the plain text content of a PDF.
PDF to Markdown
Best-effort Markdown conversion, with headings guessed from font size.
Extract Text from Scanned PDF
Real OCR (Tesseract) for scanned or image-only PDFs.
Add Page Numbers
Stamp sequential page numbers onto every page.
Add Watermark
Overlay diagonal watermark text across every page.
Fill & Flatten PDF Form
Fill a fillable PDF form and bake the values in permanently.
Sign PDF
Draw a visual signature onto a page (not a cryptographic signature).
Redact PDF
Permanently black out sensitive regions — the text underneath is genuinely destroyed.
Compare PDF
Line-level text diff between two PDFs.