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.

• Color Converter

  HEX ↔ RGB ↔ HSL with live preview swatch.

• Epoch Timestamp Converter

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

• Markdown Preview

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

• Regex Tester

  Live regex matching with highlighted results & groups.

• Text Diff

  Line-by-line comparison with colored changes.