Small tools, done right.

Every Aporizma tool runs entirely in your browser — your files and data never leave your device.

• PDF Merger

  Combine PDFs into one file, privately on your device.

• PDF Splitter

  Extract pages or ranges from a PDF, on your device.

• Image Resizer & Compressor

  Shrink photos to JPEG/WebP, privately on your device.

• Word & Character Counter

  Count words, characters, sentences, paragraphs and reading time.

• QR Code Generator

  Text or link to QR code, PNG download, in your browser.

• Password Generator

  Strong random passwords, generated offline on your device.

• SRT ↔ VTT Converter

  Convert subtitle files both ways, privately in your browser.

• Subtitle Merger

  Combine two SRT/VTT files into one timeline.

• Subtitle Sync Shifter

  Fix out-of-sync SRT/VTT timing by shifting all cues.

• LLM API Cost Calculator

  Compare Claude, GPT and Gemini API costs for your workload.

• JSON Formatter

  Format, validate & minify JSON with exact error location.

• Base64 Encoder

  Encode/decode Base64, UTF-8 safe — emoji & accents survive.

• Cron Expression Builder

  Build or decode cron schedules in plain language.

• YouTube Title & Thumbnail Preview

  Preview truncation and legibility before you publish.

• Public Domain Day Calendar

  Which authors enter the public domain, year by year.

• Age Calculator

  Exact age in years, months, days — plus a countdown to the next birthday.

• Aspect Ratio Calculator

  Calculate ratios and missing dimensions for photos and video.

• Camera → PDF

  Photograph pages, get one PDF. On-device, ad-free.

• Case Converter

  UPPER, lower, Title, camelCase, snake_case and more — instantly.

• Invisible Character Cleaner

  Remove zero-width chars, collapse double spaces, fix curly quotes.

• Color Converter

  HEX ↔ RGB ↔ HSL with live preview swatch.

• Color Palette from Image

  Pull dominant colors from a photo, with copyable hex codes.

• CSV ⇄ JSON Converter

  Convert CSV to JSON or JSON to CSV instantly — no upload.

• Date Difference Calculator

  Days, weeks, months, years and business days between two dates.

• Epoch Timestamp Converter

  Convert Unix timestamps to dates and back, seconds or milliseconds.

• Hash Generator

  Generate SHA-1/256/384/512 hashes from text.

• HTML Entity Encoder

  Encode/decode HTML entities — & < > and more.

• JWT Decoder

  Decode a JWT's header & payload — signature not checked, nothing leaves your browser.

• Line Tools

  Sort, dedupe, trim and reverse lines of text — combine any options.

• Markdown Preview

  Live Markdown rendering: headers, lists, code, links.

• CSV to Markdown Table

  Turn pasted CSV or TSV into a Markdown table instantly.

• Percentage Calculator

  Percent of a number, percent change, and discount price — three tools in one.

• QR Code Reader

  Scan QR codes with your camera, decoded on-device.

• Reading Time Calculator

  Estimate reading time and speaking time from word count.

• Regex Tester

  Live regex matching with highlighted results & groups.

• Roman Numeral Converter

  Number ↔ Roman numerals, instant, accurate up to 3999.

• Slug Generator

  Title to SEO slug, Turkish characters handled correctly.

• Subtitle to Transcript

  Strip timestamps from SRT/VTT and get a flowing plain-text transcript.

• Text Diff

  Line-by-line comparison with colored changes.

• Unit Converter

  Length, weight, temperature, and volume — metric and imperial, instant results.

• UUID Generator

  Generate RFC 4122 UUID v4 values, one or in bulk.