Anna Lewiński
Editor at FileKiwi
Anna Lewiński is the editor of FileKiwi. She writes and reviews our guides about image formats, PDF files and getting documents to the size that online forms ask for.
Before an article is published, Anna checks every step on real files: iPhone photos in HEIC, screenshots, scanned documents and exports from office apps, on Windows, macOS, iPhone and Android. When a tool or a step changes, she updates the guide and its date.
Anna also reviews the help text on each FileKiwi tool page, so the explanations match what the tool really does.
Editorial standards
- We only describe features that exist and say clearly where a tool has limits.
- Facts about file formats are checked against the original specifications and vendor documentation.
- Guides are updated when operating systems or our tools change.
Found a mistake or have a question about a guide? Write to contact@filekiwi.com.
Articles by Anna
What Is a JFIF File? How to Convert JFIF to JPG
Your saved image ends in .jfif and a form will not accept it. Here is what JFIF really is and the quickest ways to turn it into a JPG.
How to Remove a Photo Background and Get a White One
A plain white background makes products, portraits and CV photos look clean. Here is how to get one in seconds, plus tips for sharp edges.
How to Merge PDF Files on Any Device
Need one PDF instead of five? Here is how to merge PDF files on Windows, Mac, iPhone and Android, and how to keep the result neat and small.
AVIF Explained: What It Is and How to Convert It to JPG
Saved an image and got an .avif file that nothing opens? Here is what AVIF is, why websites love it, and how to turn it into a JPG in seconds.
How to Reduce Photo Size to 20 KB or 50 KB
Application forms often want a photo under 50 KB and a signature under 20 KB. Here is how to get there while keeping the image sharp.
How to Compress a PDF to 200 KB for Online Forms
Online forms often reject PDFs above 200 KB. Learn what makes a PDF heavy, how to shrink it fast, and what to try when it still will not fit.
WebP vs PNG vs JPG: Which Image Format Should You Use?
JPG, PNG and WebP all show pictures, but they compress them very differently. Learn which one to pick for photos, logos, websites and uploads.
What Is a HEIC File and How to Open It on Windows
Your iPhone saves photos as HEIC, but many PCs and websites cannot open them. Here is what the format is and the easiest ways to open or convert it.