What GustKit is
GustKit is a website of small tools for PDF, image, video, audio and a few network tasks. You do not need an account. There is no sign-up wall on the tool pages.
The engines are the ones named in the Privacy policy: pdf-lib and PDF.js for documents, the browser canvas for images, FFmpeg and Whisper compiled to WebAssembly for audio and video, and fflate for ZIP. Your browser downloads those engines. The requests do not contain your file.
What stays on your device
For the browser tools, the file is opened in this tab and processed there. Closing the tab drops that data. We do not keep a copy of those files, and we do not read them to train a model.
What does not stay on your device
Share files is different. The files you send go over HTTPS and are stored in Cloudflare R2, encrypted at rest. A free link lasts at most 7 days (1 hour, 1 day, 3 days or 7 days). When it expires, the site refuses the download and deletes the files. A lifecycle rule on the bucket deletes objects under uploads/ that are older than 7 days, even if nobody opens the link.
What is my IP contacts a server. GustKit reads the address the connection presents and queries ip-api.com for the country, region, city, timezone, ISP and whether the range looks like a proxy, a mobile network or a hosting provider. We do not store those lookups.
WHOIS lookup sends the domain you type to a public RDAP registry (the one IANA lists for that ending, or rdap.org when that list is unavailable). The answer is public registration data. We do not store the query. A shared cache may keep that public answer for about an hour.
Who writes the pages
GustKit writes and revises these pages. The byline says GustKit Editorial Team because that is the group responsible for the text. We do not list personal names, job titles or outside credentials here. We are not claiming any.
There are no customer reviews and no usage counts on the site. The quick picks on the home page are chosen by hand.
How we keep a page accurate
The date on a tool page is the last day that page's text changed. It is not the day the site was built. A page with no newer edit keeps the site content date from the last real content change.
Ads and money
The tools are free. Pages reserve space for ads. An ad partner is only turned on with consent where the law requires it, and the privacy policy will name it. We do not sell your files.
Where to start
The tools are grouped by file type: PDF tools, Image tools, Video & audio tools and Network & Domains. The full list is on All tools.
The GustKit step-by-step guides explain one task from start to finish, for example How to merge PDF files without uploading them, How to compress a PDF without uploading it and How to turn JPG photos into one PDF.
Contact
Questions, corrections and reports go to [email protected]. The details of what we store are on the Privacy policy.