ConvertKiwi
Guides and tips
Practical, tested advice on image, PDF, video and audio files: which format to choose, how to make files smaller and how to get the best result from every conversion.
WEBP vs PNG vs JPG: Which Image Format Should You Use?
A plain-English comparison of WEBP, PNG and JPG: file size, quality, transparency and compatibility, plus a simple rule for picking the right one.
Read the guide →How to Reduce a Video File Size Without Ruining the Quality
Why phone videos are so large, what actually makes a video file smaller, and which settings to use for email, chat apps and uploads.
Read the guide →How to Turn Phone Photos of Documents Into a Single PDF
Take clean photos of documents with your phone and combine them into one tidy PDF for job applications, visas, schools and forms.
Read the guide →How to Merge PDF Files Into One (in the Right Order)
Combine several PDFs into a single document online: how to get the page order right, what to do with password-protected files and how to include photos.
Read the guide →MP3 vs WAV vs OGG: Which Audio Format Should You Use?
How MP3, WAV and OGG differ in quality, file size and compatibility, and which format to use for music, podcasts, editing, games and the web.
Read the guide →How to Extract the Audio From a Video (MP4 to MP3)
Save the soundtrack of a video as an MP3 or WAV file: for lectures, interviews, voice memos and your own recordings, with tips for the best quality.
Read the guide →iPhone Videos Won't Play on Windows or Android? Convert MOV to MP4
Why iPhone MOV videos often fail on Windows, Android, smart TVs and websites, how to convert them to a universally compatible MP4, and how to avoid the problem.
Read the guide →How to Make a Good-Looking GIF From a Video
Turn a video clip into an animated GIF that looks sharp and stays small: how GIFs work, how to pick the right clip and why some GIFs look grainy.
Read the guide →How to Compress Images for a Faster Website
Images are usually the heaviest part of a web page. Learn how to pick the right format, size and compression so pages load fast without images looking worse.
Read the guide →How to Get and Use the Transcript of a YouTube Video
How YouTube transcripts work, how to get one in seconds, and practical ways to use them for studying, research, quoting, accessibility and content creation.
Read the guide →How to Add Subtitles to a Video (Automatically, for Free)
Add subtitles to a video in minutes: automatic transcription, fixing mistakes, choosing a readable style, and when to use an SRT file or subtitles burned into the video.
Read the guide →How to Make a QR Code for Your Wi-Fi (So Guests Connect in One Scan)
Create a QR code that connects phones to your Wi-Fi without typing the password: what goes inside it, how to print it well and how to keep your network safe.
Read the guide →iPhone Photos (HEIC) Won't Open on Windows? Here Is How to Fix It
Why iPhone photos arrive as HEIC files that Windows, websites and older apps cannot open, three ways to fix it and the iPhone setting that stops it happening.
Read the guide →How to Reduce a PDF File Size for Email and Upload Forms
Why some PDFs are huge, how compression shrinks them without making text blurry, which level to choose and what to do when a PDF is still too big.
Read the guide →How to Remove the Background From a Photo (for Stores, Profiles and Designs)
Cut the subject out of a photo automatically, then choose a transparent, white, colored or blurred background. Tips for product photos, profile pictures and clean edges.
Read the guide →How to Turn a WhatsApp Voice Message or Audio Recording Into Text
Save a WhatsApp voice message, iPhone voice memo or recording as a file and turn it into text you can read, copy and search. Steps for Android, iPhone and computer.
Read the guide →Email Attachment Too Large? How to Shrink Videos, PDFs and Photos to Fit
Gmail, Outlook and Yahoo limit attachments to 20–25 MB. How to make a video, PDF or set of photos small enough to send, and what to do when it still does not fit.
Read the guide →Image Sizes for Instagram, Facebook, WhatsApp and YouTube (and How to Resize)
Pixel sizes for posts, stories, thumbnails and profile photos on Instagram, Facebook, WhatsApp, YouTube and X, and how to crop and resize photos to match.
Read the guide →How to Extract Pages From a PDF (and Fix Sideways Pages)
Save only the pages you need from a PDF, split it into one file per page, reorder pages and fix sideways scans. Free, in your browser, with no upload.
Read the guide →How to Save a PDF Page as an Image (JPG or PNG)
Turn PDF pages into pictures you can post, send in a chat or put in a slide. When to choose JPG or PNG, how to get just one page, and how to keep small text readable.
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