Auxbox Tools
Free, simple tools that work — no sign-up, no nonsense.
CGPA Calculator
Calculate your cumulative GPA and CGPA with precision. Supports custom grade scales and saves your data locally.
Open tool →QR Code Generator
Generate offline QR codes instantly — with or without a logo. The QR code embeds your link directly, no internet needed to scan.
Open tool →Salary Raise Calculator
See exactly what a raise looks like across hourly, weekly, monthly and annual pay. Edit any field and the rest update in real time.
Open tool →Password Generator
Generate strong, cryptographically random passwords entirely in your browser. Tune length and character classes, see live entropy and strength.
Open tool →Wheel Spinner
Random picker for any list. Choose Quick Pick or a colourful Spin Wheel — fair (cryptographic randomness) and fully offline.
Open tool →Markdown Preview
Type GitHub-flavored markdown on the left, see safe rendered HTML on the right. Auto-saved, sanitized, and runs entirely in your browser.
Open tool →Markdown to PDF
Type markdown, pick a print preset (default, academic, or minimal), and save as a clean paginated PDF — using your browser, no upload.
Open tool →Date Calculator
Find the difference between two dates, or your age from a date — in years, months, days, weeks, hours, and working days. Calculated locally.
Open tool →Stopwatch
Big-display stopwatch with laps, keyboard shortcuts, and a tab-title timer. Survives reload and runs entirely in your browser.
Open tool →Pomodoro Timer
Focus timer with configurable work and break durations, daily history, sound cue, and optional desktop notifications. Runs entirely in your browser.
Open tool →Cron Expression Explainer
Decode any cron expression into plain English and see the next 5 fire times in your local time zone. One-click presets for common patterns.
Open tool →PDF Merger
Combine multiple PDFs into one. Drag to reorder, optionally pick per-file page ranges, and download — files never leave your browser.
Open tool →Image Compressor
Shrink JPEG, PNG, and WebP images entirely in your browser. Pick a quality, optionally cap dimensions, and download — no uploads, ever.
Open tool →Freelance Rate Calculator
Quote a job, project income from a rate, or back-solve the rate that hits a target take-home. Costs, fees, taxes, team and profit margin in one place.
Open tool →Bill & Tip Calculator
Bill amount, tip percent, and number of people — see the total and what each person owes. Mobile-friendly, runs entirely in your browser.
Open tool →Bill Splitter
Split a restaurant bill by item — add diners, what each ordered, tax and tip. See exactly who owes what. Browser-only, no upload.
Open tool →Hash Generator
Compute SHA-256, SHA-512, SHA-1 and MD5 hashes for any text or file. Verify checksums in your browser — input never leaves your device.
Open tool →UUID Generator
Generate UUID v4 (random) or UUID v7 (timestamp-ordered) in bulk. Per-row copy, copy-all, download .txt. Browser-only.
Open tool →JSON Formatter
Pretty-print, minify, and validate JSON with line/column error reporting. Sort keys, pick the indent. Runs entirely in your browser.
Open tool →Timestamp Converter
Convert between ISO 8601, Unix seconds, Unix milliseconds, and human-readable local time. Time-zone selector, Now button. Browser-only.
Open tool →PDF Splitter
Drop a PDF and pick page ranges (e.g. 1-3,5,7-9) to download a new PDF with just those pages. Files never leave your browser.
Open tool →Image Format Converter
Convert between PNG, JPEG, and WebP entirely in your browser. Pick quality, see the size change, download. No upload.
Open tool →Color Contrast Checker
WCAG 2.1 contrast ratio for any foreground/background pair. AA + AAA pass/fail for normal and large text. Hex, RGB, HSL accepted.
Open tool →Regex Tester
Live regex match highlighting + capture-group display. JS regex flags, common-pattern presets (email, URL, IPv4, hex color, ISO date).
Open tool →Time Zone Converter
One anchor moment, many zones. Pick a date/time + source zone, see the same instant in any number of others. Add up to 12 zones; reorder with up/down.
Open tool →CSV ↔ JSON Converter
Convert CSV to JSON or JSON to CSV. Auto-detects delimiter, optional type inference, header row toggle, pretty/minified JSON. Browser-only.
Open tool →Favicon Generator
Upload one image → favicon-16, 32, 180 (Apple touch), 192, 512 (Android), and a multi-resolution favicon.ico. Download as a single zip.
Open tool →Palette from Image
Upload an image → extract its dominant colors via median-cut quantization. Output as hex, RGB, or nearest Tailwind class.
Open tool →Exchange Rates
Look up live or historical currency exchange rates. Pick a base, a date, and any number of targets — see the rate table instantly. Browser-only, no API key.
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