Guides for private file work
Every guide here follows the same rule as the tools: it tells you exactly where your file goes. Most steps never leave your machine, and the Cloud AI guides say plainly when a file is uploaded. No numbers we cannot back up.
Latest guides
How to Remove a Date Stamp from a Photo
Why EXIF tools cannot erase a burned-in date, and how to remove the stamp with text, brush or box selection in under a minute.
PDFResume PDF Too Large to Upload? How to Shrink It
Why an application form rejects a resume PDF, what a lossless rewrite can and cannot shrink, and how to tell a text resume from a scanned one before compressing it.
PDFHow to Combine Receipts Into One PDF
Turn a stack of receipt photos into one PDF: set the page order, pick A4 or Letter, and understand why the result still is not searchable.
PDFMerge Documents Into One PDF for an Application
A four step pipeline for visa and school applications: photos to PDF, merge, reorder, then compress, with the page size caveat nobody mentions.
VideoYouTube Shorts Size: 1080x1920 in a 9:16 Frame
Why Shorts wants 1080 by 1920 in a 9:16 frame, how the crop presets scale by height rather than width, and where the crop sits in a landscape clip.
AudioHow to Compress a WAV File (and What You Lose)
WAV is uncompressed PCM, so shrinking one means encoding to MP3, M4A or OGG. What the target size field can reach, and what it cannot.
Cloud AITranscribe a Video to Text for Free, and Know What You Get
What a free video transcript really includes: the daily allowance, the two supported languages, the 30 MB ceiling, and why this one uploads your file.
VideoTikTok Video Size: the 9:16 Frame and Everything Else
Export at 1080x1920, understand what happens to square and landscape clips, and crop a widescreen video to 9:16 without uploading it.
PDFWhat Lossless PDF Compression Actually Does to File Size
Eight test PDFs run through qpdf and measured byte for byte: three came out larger, the worst by 20.8 percent, and a second pass never changed anything.
Cloud AIHow to Enhance Video Quality Online With AI
Upscale a clip to 720p, 1080p, 2K or 4K with AI, see what each resolution costs per minute before you run it, and read the limits that decide whether it is worth a credit.
ImageWebP vs AVIF: Which Image Format Should You Use in 2026
WebP and AVIF compared on browser support, transparency and encoding time, plus why the converter ships a WebAssembly AVIF encoder instead of relying on the browser's canvas.
PDFCan You Compress a PDF to 500 KB? What Actually Works
Why a lossless PDF optimiser has no target size box, which files can be brought near 500 KB and which will not move at all, and the workflows that do hit a number.
VideoInstagram Video Size and Aspect Ratio: 1:1, 4:5 and 9:16 Explained
The aspect ratio each Instagram placement expects, how to crop a landscape clip to 9:16 or 4:5 without stretching it, and what a crop cannot fix.
VideoWhatsApp Video Size Limit: Why Your Clip Will Not Send
What WhatsApp's published media limits actually say, why its own pages disagree with each other, and how to bring a video under the limit without uploading it anywhere.
ProductivitySlack File Upload Limit: What the 1 GB Cap Really Means
Slack accepts files up to 1 GB, so the real constraints are the free plan's 90 day history window and what the person receiving the file has to download.
Cloud AIremove.bg Alternatives: What Changes After the December 2026 Migration
What remove.bg's move into Canva means for existing credits, when its API and plugins are still the better choice, and how a metered background remover compares.
WorkflowHow to Prepare Product Photos for an Online Store
A five step workflow for listing photos, from cutout to compression to watermark, with the honest note that only the background removal step uploads anything.
ImageHow to Resize an Image Online in Pixels or Percent
Resize an image online for free by typing a width and height or picking a percentage. Keep the aspect ratio locked, export as JPG, PNG or WebP, and the file never leaves your device.
PDFHow to Rotate a PDF Online Free, Without Uploading It
Rotate a PDF online for free, either every page or a range such as 1,3,5-7. The page orientation is rewritten in place, so the text, links and images stay exactly as they were.
VideoHow to Crop a Video Online for TikTok, Reels and Square Posts
Crop a video online to 1:1, 9:16, 16:9 or 4:5, choose which part of the frame to keep, and scale the output to 1080p, 720p or 480p without uploading the clip.
VideoHow to Mute a Video Online Without Re-encoding the Picture
Mute a video online by removing the whole audio track. The video stream is copied rather than re-encoded, so the picture keeps its original quality and the export stays quick.
AudioHow to Change the Pitch or Speed of an Audio File Online
Change audio pitch or speed online between 0.5x and 2x and up to twelve semitones, with the two controls independent, so slowing a track down never lowers its pitch.
PDFAdd Page Numbers to a PDF Online Free
Add page numbers to a PDF online for free. Choose the position, starting number, format, font and skip the cover page, then download. Nothing is uploaded.
PDFAdd a Watermark to a PDF Online Free (No Upload)
Add a watermark to a PDF online for free: stamp CONFIDENTIAL or DRAFT across every page or a page range, with control over size, color, opacity and angle. No upload.
PDFSign a PDF Online Free With a Drawn Signature
Sign a PDF online free by drawing your signature with a mouse, finger or stylus, or uploading a signature image, then placing it on the page you choose. Nothing is uploaded.
PDFEdit or Remove PDF Metadata Before You Send a File
Edit or remove PDF metadata in your browser: change the title, author, subject, keywords, creator and producer fields, or clear them all, then download. Nothing is uploaded.
PrivacyHow to Remove EXIF Data From Photos Without Losing Quality
Remove EXIF data from a JPEG or PNG in your browser. See the camera, GPS and timestamp fields, then strip them losslessly, with no upload and no quality loss.
VideoHow to Extract Frames From a Video and Save Them as Images
Extract frames from a video online free and save any moment as a PNG, JPG or WebP image. The clip is decoded in your browser with Canvas, so it is never uploaded.
VideoHow to Burn Subtitles Into a Video Permanently (Free, No Upload)
Burn subtitles permanently into a video, free and in your browser. Add an SRT, VTT, ASS or SSA file, style the caption, then export an MP4 with the text visible on any platform.
VideoConvert SRT to VTT Online Free, No Upload
Convert SRT to VTT online for free with no upload. Rewrite the timecodes, add the WEBVTT header and fix the timing in your browser, then download the file.
AudioMerge Audio Files Online Free, No Upload
Merge audio files online free in the browser: add up to 20 tracks, set the order, and join them into one MP3, WAV, M4A or OGG file with no upload and no sign-up.
AudioCompress an Audio File Online Free, No Upload
Compress an audio file online, free and without uploading. Enter a target size in MB and the browser tool works out the bitrate, then exports MP3, M4A or OGG.
AudioIncrease Audio Volume Online Free, No Upload
Increase audio volume online for free. Add up to +20 dB of gain or normalize loudness to a streaming, podcast or broadcast target in your browser, with nothing uploaded.
RecordingHow to Record Audio Online With a Browser Voice Recorder
No install and no account: record audio online in your browser, pause and resume, then download the take or convert it to MP3. Your voice never leaves your device.
ImageHow to Add a Watermark to Photos Online
Putting text watermarks on photos in the browser, the six positions including tiled, why the export keeps your full original resolution, and the batch limit that catches people out.
ImageHow to Crop an Image Online Without Uploading It
Cropping to a free shape or a locked ratio such as 1:1 or 16:9, rotating before the crop so the frame follows the straightening, and why batch cropping reuses one relative frame.
ImageHow to Upscale an Image Online (2x, 4x, 6x and 8x)
Enlarging photos with a super resolution model that downloads into your browser, how it differs from the cloud AI enhancer, and why it rebuilds edges rather than recovering detail that was never captured.
PDFHow to Convert a PDF to JPG Without Uploading It
Turning every page into a JPG or PNG at 72, 150 or 300 DPI in the browser, and the irreversible cost nobody mentions: the text layer disappears, so the page stops being searchable.
VideoHow to Trim a Video Online Without Uploading It
Cutting the start and end off a clip in the browser, why Precise re-encodes to land on the exact frame while Fast copies streams at the nearest keyframe, and how to cut a section out of the middle.
VideoHow to Convert a Video Format Without Uploading It
Switching between MP4, WebM, MKV, MOV, GIF and MP3 without uploading, why changing the container does not improve quality, and when the dedicated GIF and audio tools do a better job.
VideoHow to Merge Videos Online Without Uploading Them
Joining clips in order in the browser, why every clip is re-encoded first so mixed sources still fit together, and the memory ceiling that decides how many files are safe to combine.
RecordingHow to Record From Your Webcam Online
Recording in a browser tab with nothing installed, why the output is WebM, why the mirror toggle only changes the preview, and the fact that the microphone is always on.
AudioHow to Convert Audio Files Online Without Uploading Them
Converting between MP3, WAV, M4A, OGG and FLAC locally, why the bitrate setting stops applying for WAV and FLAC, and why re-encoding a lossy file always costs quality.
Cloud AIHow to Enhance Photo Quality Online With AI
How AI enhancement, denoising and 1x to 4x enlargement differ, why the three models cost 1, 6 and 40 credits, and the honest warning that texture-first enhancement invents detail your photo never had.
Cloud AIRemove an Object From a Photo Online Free
Three ways to erase something from a photo (all the text, icons and logos, or a dragged box rebuilt from the surrounding texture), the upload trade-off, and when erasing a watermark crosses into copyright trouble.
VideoHow to Convert a Video to GIF Without Uploading It
Why most video to GIF conversions look grainy, how a colour palette generated for your specific clip fixes it, and the three settings that decide whether the result is shareable or enormous.
VideoHow to Rotate a Video Online Without Uploading It
Turning a sideways clip the right way up in the browser, why the preview is a CSS simulation while the export re-encodes for real, and what the four rotate and flip buttons do when stacked.
VideoHow to Change the Speed of a Video (Slow Motion and Faster)
Speed from 0.25x to 4x in the browser with nothing uploaded, how Keep pitch uses atempo so voices stay natural, and why slowing a clip down repeats frames instead of inventing smooth motion.
AudioHow to Remove Vocals From a Song (and What It Costs)
What one click of AI vocal separation returns, the 30 second ceiling on the free tier, the five credits each 30 seconds costs, and why even a five second clip takes about two minutes.
AudioTrim Audio Online Without Uploading It
Cut MP3, WAV, M4A, OGG or FLAC on a live waveform in the browser, add a fade of up to five seconds, and export as MP3 or WAV with nothing uploaded and no account needed.
PDFGmail Attachment Size Limit: How to Fit a PDF Into an Email
What Gmail's attachment limit really applies to, why base64 encoding pushes a file about a third larger than it looks, and how to compress or split a PDF without handing the document to a converter site.
Cloud AIRemove Background From Image Free: What the Free Tier Really Gives You
What free actually means on an AI background remover: one guest run a day, five credits once signed in, and a plain account of the fact that this Cloud AI tool uploads your image while the other 45 tools do not.
ImageHow to Compress an Image to 100 KB Without a Target Size Box
Why this compressor has no field to type 100 KB into, what the quality and resize sliders really change, and the honest repeat-and-read loop for getting a photo under a 100 KB upload limit.
ImageHow to Convert WebP to JPG Without Uploading
What WebP is, why upload forms and older software still reject it, and how to convert WebP to JPG or PNG in the browser with nothing sent to a server, plus why HEIC is a separate problem.
PrivacyHow 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