File Privacy and Browser Tool Guides

Exact-size image guide

How to resize an image to 200x200 without uploading it

A practical guide to making an exact 200x200 image in your browser while preserving aspect ratio and avoiding file uploads.

Local PDF compression guide

What to check when reducing PDF file size without sending the document to an upload server.

Exact pixel resizing

A practical guide to exact-width and exact-height image resizing, including crop, fit, aspect ratio, and local browser processing.

PDF upload limits

How to reduce a PDF toward a specific KB or MB limit while checking quality, page count, and browser-local processing.

Image upload limits

How image KB limits work, why JPG, PNG, and WebP compress differently, and how to keep image compression local in the browser.

Image format conversion

A guide to local image conversion between JPG, PNG, WebP, AVIF, HEIC, BMP, ICO, and SVG using browser capabilities.

Privacy verification guide

A plain-language checklist for checking whether a browser file tool adds upload-capable network requests during processing.

Upload size limits

How to convert KB and MB for upload forms, understand binary file-size math, and leave enough room before submitting a file.

Pricing math

A plain-English guide to margin, markup, selling price, and profit so pricing calculations do not mix up cost and revenue.

QR code safety

How to inspect the text inside a QR code before opening it, using a local browser-based QR reader.

Hashing guide

What a SHA-256 hash is, when to use one, and why local browser hashing is useful for checksums and repeatable text fingerprints.