Guides for private file work
Every guide here follows the same rule as the tools: your file stays on your machine. No step that starts with uploading it, and no numbers we cannot back up.
Latest guides
How Browser-Based File Tools Work (and Why Nothing Gets Uploaded)
The engine stack behind client-side processing: WebAssembly running qpdf, FFmpeg and Tesseract, the Canvas API for images, Web Workers for long jobs and the File API for reading a file without a server. Includes the real costs, from first-run engine downloads to the memory ceiling.
PrivacyHow to Check Whether an Online Tool Uploads Your File
Open the network panel, clear it, load a file and watch the size column. Then cut the connection and run it again. Three tests anyone can run, plus the analytics and engine requests that look alarming but carry no file data.
PrivacyWhere Your File Actually Goes When You Upload It to an Online Converter
The server-side path an uploaded file takes, from the multipart form to the temporary directory to the worker running the encoder, and what a deletion promise really guarantees. Plus how to read a retention policy.
PrivacySensitive Documents and the Cloud: A Practical Guide for HR, Legal and Healthcare Teams
How to sort documents by sensitivity, what happens when one goes to a third-party tool, and the habits that keep exposure to a minimum. Practical guidance only, with no compliance claims.
PDFCompress a PDF Without Uploading It: What Actually Works
A lossless structural rewrite, not a lossy re-encode. What it genuinely shrinks, why some PDFs come out slightly larger, and when deleting pages or rasterizing is the better fix.
PDFHow to Remove a PDF Password You Know (Without Uploading It)
Removing a password is a job for a password you already have, not a crack. How open passwords and permission flags differ, why uploading a locked statement hands over the file and the password together, and the limits of the tool.
PDFPassword Protect a PDF Before You Email It (AES-256, Locally)
Set an open password, an optional owner password and the print, copy and edit permissions, then encrypt with AES-256 in the browser before the file goes anywhere.
PDFMerge and Split PDFs on Your Phone Without an App
Combine PDF files on a phone, or split one into ranges, single pages or fixed chunks, in a browser tab. No app to install, no email-to-yourself loop and no upload.
PDFFrom Scan to Protected PDF: A Four-Step Private Workflow
Build the PDF, extract searchable text, tidy the pages and encrypt with AES-256, using four browser tools and never uploading the document.
OCROCR Without Uploading: Extracting Text From Scans, Screenshots and Photos
How the two-pass design reads a text layer instantly and only falls back to OCR on genuinely scanned pages, which languages are available, and the scans that defeat it.
VideoHow to Compress a Video for Discord (Under 25 MB, No Upload)
Discord does not re-encode an oversized video, so the clip has to fit before you send it. The resolution, frame rate and quality settings that clear the 25 MB cap, plus the cases where a browser compressor is the wrong tool.
VideoHow to Add a Watermark to a Video for Free (Text or Logo, No Upload)
Brand or protect a clip with a text or logo overlay, five positions and no forced branding of ours. Includes the one limit to know: built-in text watermarks cover Latin characters only.
RecordingHow to Record Your Screen Without Installing Anything
No installer, no account, no watermark. What a browser screen recorder captures, why it cannot record system audio, and when a desktop app is still the right tool.
RecordingRecording Your Screen for a Bug Report Without Shipping Your Screen Anywhere
What a usable bug repro clip must show, what to keep out of frame, and why an internal screen should never go through a third-party recorder service.
AudioHow to Convert a Video to MP3 Without Uploading It
Extract the audio track in the browser tab, with the supported containers, the MP3, M4A and WAV output options, the three bitrates and the limits that come with a local encoder.
What the guides cover
Four areas, matching how the tools are grouped. Each guide answers the question first, then shows the exact steps and states plainly where a tool stops working.
Private file handling
How browser-based processing works, how to check for yourself that a tool never uploads your file, and what actually happens to a document on a server-based converter.
For: contracts, ID scans, medical and HR documentsPDF workflows
Merging, splitting, OCR, passwords and size reduction. Includes what lossless structural optimization can and cannot shrink, so you know when to reach for a different fix.
For: applications, invoices, scanned paperworkVideo and recording
Compressing footage for chat and email limits, trimming, adding a watermark and extracting audio, plus screen and webcam recording without installing a capture app.
For: Discord and email limits, tutorials, bug reportsImages and Cloud AI
Compressing, converting, cropping and OCR for photos and screenshots, and honest comparisons for the Cloud AI jobs that a browser still cannot run locally.
For: product listings, social posts, photos and scans