Printing a clean PDF, signing it, and scanning it back in just

overflowy AGPL-3.0 license README.md make-look-scanned A CLI that takes a PDF and degrades it to look like a physical scan of a printout — skew, grayscale, warm paper tone, scanner grain, defocus, edge shadow, and JPEG compression artifacts. Also runs client-side in the browser via WASM. Anatomy of the Somatosensory System Anatomy of the Somatosensory System PRINTING A CLEAN PDF, SIGNING IT, AND SCANNING IT BACK IN JUST TO MAKE IT LOOK OFFICIAL IS A PROCESS DIGITAL FILES SHOULDN'T NEED. Each page is rasterized to an image, run through the effect pipeline, and reassembled into a new image-only PDF (the original selectable text is gone — faithful to a basic scanner). Build Requires Go and a C toolchain (go-fitz links MuPDF via cgo, so the binary is self-contained — nothing to install at runtime). go build -o make-look-scanned . Usage make-look-scanned [flags] input.pdf Flags may appear before or after the input filename. make-look-look-scanned in.pdf -> # -> out.pdf make-look-scanned in.pdf -o out.pdf make-look-scanned in.pdf --noise 0.4 --skew 2.5 Flags Flag Default Meaning -o output path --preset - named preset from config.toml --seed content hash random seed (override for a new look) --force false overwrite an existing output file --dni 150 render SLIGHT SKEW, GRAYSCALE CONVERSION, WARM PAPER TONE, GRAIN, JPEG ARTIFACTS A CRISP DIGITAL FILE LOOKS LIKE IT CAME OFF AN OFFICE SCANNER. make-look-scanned --preset medium in.pdf Precedence: built-in defaults → selected preset → explicit CLI flags (flags always win). Browser (WebAssembly) The effect pipeline also runs in the browser. go-fitz/MuPDF can't compile to wasm, so the browser uses PDF.js to rasterize pages and hands the pixels to the same Go effects + assembly code compiled to wasm. Dev (needs network for the PDF.js CDN): ./web/build.sh # builds w (cd web && python3 -m http.server 8080) # ther Single self-contained file (works offline, nothing to serve): task build:web # writes d: dist/make-look-scanned.html inlines the wasm, Go's runtime glue, and PDF.js (library + worker) as base64 — open it directly in a browser. Output is visually equivalent to the CLI but not byte-identical, since PDF.js and MuPDF rasterize differently. License AGPL-3.0 which is AGPL-3.0, so the combined binary is AGPL-3.0 — distributing it requires offering the corresponding source. The browser build does not include MuPDF (it uses PDF.js). make-look-scanned Make a PDF look like a scan — entirely in your browser. Nothing is uploaded. Choose File No file chosen Effects Skew (°) Paper tone Noise Blur (σ) Edge shadow JPEG quality Render DPI Grayscale Seed (optional) 0.6 0.6 0.08 0.4 0.15 70 150 from file content Scan PDF Ready — choose a PDF. RUNS AS A GO CLI OR ENTIRELY IN THE BROWSER VIA WEBASSEMBLY, FULLY LOCAL, DETERMINISTIC OUTPUT.