Squisher

Compress PDFs/PNGs/SVGs and batch-convert images — all from a TUI.

Features

Compress Mode

• PDF — Stream recompression (zlib level 9), unused object cleanup, metadata stripping, stream deduplication
• PNG — Lossless optimization via oxipng
• SVG — Whitespace removal, attribute shortening, decimal precision reduction
• Interactive TUI — File browser, quality selector, real-time progress

Convert Mode

• Batch image conversion — Recursively scan a folder and convert all images
• Input formats — JPG, PNG, HEIC, WebP
• Output formats — JPG, PNG, WebP
• Size presets — Large (1920px), Medium (1280px), Small (640px)
• HEIC support — macOS sips for HEIC decoding
• Parallel processing — Uses all CPU cores
• Structure preserved — Subdirectory layout maintained in {folder}_converted/

Installation

git clone https://github.com/Dann1y/pdf_squish.git
cd pdf_squish
cargo build --release

The binary will be at target/release/pdf-squish.

Usage

# Launch TUI
cargo run --release

# Pre-fill input path
cargo run --release -- /path/to/file.pdf

TUI Controls

Key	Action
Ctrl+T	Toggle Compress / Convert mode
Tab / Shift+Tab	Cycle focus
Enter	Load files / Start
1 2 3	Compress: Quality — Convert: Output format
4 5 6	Convert: Size preset
j k / ↑ ↓	Navigate file list
d	Remove selected file
r	Reset after completion
q	Quit

Compression Levels (PDF)

Strategy	Light	Standard	Aggressive
Stream recompression (zlib best)	✓	✓	✓
Empty stream removal	✓	✓	✓
Unused object cleanup		✓	✓
Metadata stripping		✓	✓
Object renumbering		✓	✓
Duplicate stream dedup			✓

Dependencies

• ratatui + crossterm — TUI
• lopdf — PDF manipulation
• flate2 — Compression
• oxipng — PNG optimization
• image — Image decoding/encoding/resizing
• walkdir — Recursive directory traversal
• tokio — Async runtime
• sha2 — Deduplication hashing

License

MIT