Practical Engineering & Privacy Guides
In-depth walkthroughs on merging, compressing, converting, signing, and running OCR on PDF documents—explaining what actually happens under the hood. Every tutorial links to a free, 100% on-device tool you can use immediately.
Step-by-step guide to merging PDF files in 2026. Combine documents into one PDF for free, entirely in your browser, with no uploads, accounts, or watermarks.
The honest way to shrink PDF file size: when visual compression is right, when structure-preserving optimization wins, and how to preview quality before you commit.
Most online PDF tools upload your entire document to a server. Here is what that means for your privacy, the real risks, and how browser-local tools changed the model.
Convert selectable PDF text into an editable Word document entirely in your browser. No upload, no account, no conversion server — plus honest limits of PDF→DOCX.
Convert iPhone HEIC/HEIF photos to JPG, PNG, or PDF directly in your browser. Batch conversion, quality control, and live previews — without installing anything.
Run OCR on scanned PDFs entirely in your browser: recognize text in 20+ languages, review confidence, and embed an invisible searchable text layer — no server involved.
Add a visible signature to any PDF in your browser: type, draw, or upload it, drag it into position, and download. Plus what an electronic signature is legally.
Five ways to split a PDF: visual cut markers, custom ranges, fixed chunks, by target size, or every page — plus how to extract selected pages into a new PDF. All local.
Flattening turns filled form fields and annotations into permanent page content. Here's what changes, when to flatten before sending, and how to do it locally.
Crop PDF pages to remove margins, borders, or headers — with a live frame preview. Works on selected pages or the whole document, entirely in your browser.
AVIF images are everywhere in 2026 but many apps still can't open them. What AVIF is, why sites use it, and how to convert AVIF to JPG, PNG, or PDF privately.
The right way to rasterize SVG files to PNG: why export size matters, how to avoid blurry icons, and a free converter that never uploads your vectors.
ICO files are icon containers, not images. Here's how they work, how to pull the full-size PNG out of one, and why browser-local extraction beats online converters.
Convert .txt files or pasted text into polished PDFs with margins, page size, and font controls — entirely in your browser with a live preview.
The complete guide to PDF page numbers: formats, positions, facing-page layouts, skipping covers, and a free tool that previews every number before you commit.