Guides
Plain-English answers to the questions we get asked the most about file formats, privacy, and conversion. Each guide links into the relevant browser-based tool — no upload, no signup.
How to Convert SRT to VTT Subtitles (and Why You'd Want To)
SRT works in most desktop players. VTT is the format browsers expect for the HTML5 <track> element. Here's the conversion path and what changes between them.
Read guideHow to Compress a PDF (Without Wrecking the Text)
PDF compression options range from "shrinks the file 80% but text becomes images" to "invisible to the user but barely shrinks anything". Here's which trade-off you're picking.
Read guideHow to Convert AAC to MP3 (and Whether You Should)
AAC compresses better than MP3 at the same bitrate. But MP3 plays everywhere. Here's the conversion path and the audio quality you'll actually keep.
Read guideHow to Resize an Image Without Losing Quality
Resizing smaller is easy and lossless-looking. Resizing larger is where the trouble starts. Here's the difference between resize, resample, and upscale — and which one you actually need.
Read guideHow to Make an Image Transparent (Background Removal in 2026)
Transparency means an alpha channel. PNG and WebP carry it; JPEG can't. Here's how to remove a background, save the result correctly, and avoid the "why is my transparent image white" surprise.
Read guideHow to Crop a Video (Trim, Cut, or Resize the Frame)
"Crop" can mean three different things for video: trim the start/end, cut a middle segment, or resize the frame. Here's which tool to pick for each.
Read guideHow to Convert PNG to WebP (and Cut Your Image Files in Half)
WebP is roughly half the size of PNG at visually identical quality. Here's how to convert, when to keep PNG instead, and the lossy-vs-lossless trade-off.
Read guideHow to Extract Pages from a PDF (Split, Pull, or Save a Range)
Three ways to get specific pages out of a PDF: extract a single page, save a range, or burst the file into one PDF per page. Here's the workflow for each.
Read guideHow to Make a GIF from a Video (Without It Being 50 MB)
GIFs auto-loop and embed everywhere — but they're a terrible format for video. Here's how to make a good one, and why a short MP4 is sometimes the better choice.
Read guideWhat Is OPUS Audio? (And When to Use It)
OPUS is the codec WhatsApp voice notes, Discord voice chat, and Zoom all use under the hood. Here's why it's technically the best lossy audio codec — and why MP3 still dominates anyway.
Read guideHow to Convert Apple Pages to PDF
Three ways to turn a Pages document into a PDF — the built-in Pages export, iCloud, or Dropvert's server-side converter for files you don't want to open locally.
Read guideHow to Convert Apple Keynote to PDF
Export Keynote presentations to PDF for sharing on Windows / Linux / Android — three ways: Keynote's built-in export, iCloud.com, or Dropvert's server converter.
Read guideHow to Rotate a PDF
Rotate a PDF — one page or all pages — without re-scanning. Browser-based, free, no upload. Useful for fixing scans that came out sideways.
Read guideHow to Resize Images for Instagram (Every Format)
Exact pixel dimensions for Instagram feed posts, stories, reels, profile pictures, and carousels — plus a one-click resizer that handles the math for you.
Read guideHow to Make a YouTube Thumbnail (1280×720, Under 2 MB)
YouTube thumbnails must be 1280×720 px and under 2 MB. Step-by-step: resize your source image, compress it, and avoid the platform's rejection messages.
Read guideHow to Convert JPG to PNG (and When You Actually Should)
Converting JPG to PNG is straightforward — but it usually doesn't do what people think it does. Here's when the conversion actually helps and when it just makes the file bigger.
Read guideHow to Create a Favicon (Every Size You Need in 2026)
Modern favicons aren't a single file — they're a set of 7+ sizes for browsers, iOS home screens, Android, and Windows tiles. Here's the complete list and how to generate them in one shot.
Read guideHow to Blur Faces in Photos (For Privacy)
Blur faces in a single photo or a whole batch — automatically detect every face, choose pixelate vs gaussian blur, and keep the file local. No upload required.
Read guideHow to Add a Watermark to a Photo (Text or Logo)
Add text or logo watermarks to one photo or a batch — control opacity, position, rotation, and tile density. Browser-based, no upload.
Read guideHow to Convert SVG to PNG (Pick the Right Resolution)
SVGs are vector — they scale to any resolution. Converting to PNG locks them at one specific size. Here's how to pick the right size for your use case.
Read guideHow to Convert HEIC to JPEG on Windows (No Codec Pack)
iPhones save photos as HEIC by default. Windows still struggles with the format. Here's how to convert HEIC to JPEG without installing a codec pack or uploading anywhere.
Read guideWebP vs AVIF: Which Image Format Should You Choose?
Both are modern image formats that beat JPEG and PNG. WebP has near-universal browser support and is fast to encode. AVIF compresses tighter but encodes slower. Here's how to choose.
Read guideHow to Upscale an Image Without Losing Quality (AI Methods)
Make a small image bigger without it looking pixelated. Three approaches: traditional bicubic resampling, AI upscaling (Real-ESRGAN), and content-aware scaling. Browser-based options included.
Read guideHow to Compress a Video for Email (Under 25 MB)
Gmail, Outlook, and most corporate email systems cap attachments at 20-25 MB. Here's how to compress a video to fit, without obvious quality loss.
Read guideHow to Compress a Video for WhatsApp (16 MB Limit)
WhatsApp caps video attachments at 16 MB. Here's how to compress a video to fit, plus the trade-off between quality and the WhatsApp re-encode.
Read guideHow to Extract Audio from a Video (MP3, WAV, FLAC)
Pull just the audio track out of a video file. Useful for podcasts recorded on video, music videos, voice memos saved as MP4, and more. Browser-based, no upload.
Read guideHow to Trim a Video Online (Without Re-Encoding)
Cut the start, end, or both of a video while preserving original quality. Browser-based, no upload, no watermark. Stream-copy is fast and lossless; re-encode is frame-accurate.
Read guideHow to Merge PDFs Online (Free, No Upload)
Combine multiple PDF files into a single document. Drag to reorder, control merge sequence, no watermark, no signup. Browser-based — your contracts stay private.
Read guideHow to Split a PDF (Extract Pages or Break Apart)
Pull specific pages out of a PDF, or split a long document into smaller files. Pick pages visually or use range expressions. Browser-based, no upload, no signup.
Read guideHow to Make a Scanned PDF Searchable (OCR)
A scanned PDF is just images of pages — Find/Cmd+F doesn't work, you can't copy-paste text. OCR adds an invisible text layer that makes the document searchable. Here's how.
Read guideWhy Is My PDF So Big? (And How to Shrink It)
PDFs from scanners, image-heavy reports, and "save as PDF" exports are commonly 5-10x bigger than they need to be. Here's what makes a PDF huge — and how to compress without losing readability.
Read guideHow to Convert M4A to MP3 (iPhone Voice Memos and Apple Music)
iPhone voice memos and Apple Music downloads save as M4A. Most non-Apple devices and email systems prefer MP3. Here's how to convert in your browser.
Read guideHow to Remove Vocals from a Song (For Karaoke or Remixes)
AI-powered stem separation can pull the vocals out of a finished song, leaving an instrumental backing track. Browser-based, no upload, no signup. Here's how it works and what to expect.
Read guideHow to Remove Background Noise from Audio (Hum, Hiss, Room Tone)
Clean up podcast recordings, voice memos, and Zoom calls with one click. FFT-based noise reduction handles the most common problems: AC hum, room tone, traffic, white noise.
Read guideWhat Is Base64 Encoding? (And When to Use It)
Base64 is a way to represent binary data as ASCII text. It's how email attachments get sent, how images get embedded in HTML, and how API tokens get transmitted. Here's the actual story.
Read guideWhat Is WebP and Should You Use It?
WebP is a modern image format from Google that produces smaller files than JPEG and PNG with comparable quality. Here's when to use it, when not to, and how to convert.
Read guideHow to Remove EXIF Data From Photos (Phone or Computer)
EXIF data embedded in photos can include GPS coordinates, camera serial numbers, and timestamps. Here's how to strip it before sharing — without uploading anything.
Read guidePNG vs JPEG: Which Image Format Should You Use?
PNG is lossless and supports transparency. JPEG is smaller for photographs. The right choice depends on the image content — here's how to decide.
Read guideHow to Compress a GIF for Discord, Slack, and Email
GIFs are huge. Here's how to compress one to the size limits Discord (10 MB free / 500 MB Nitro), Slack (1 GB), and email (typically 25 MB) actually allow.
Read guideHow to Make a Transparent PNG (Background Removal Step-By-Step)
Removing the background from an image and saving it as PNG with transparency. Browser-based, no Photoshop, no upload.
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