About
Who builds the site and why it runs in the browser
What this site does
This is a small collection of tools that handle everyday file conversions inside the browser: building a PDF from images, turning PNG into JPG, shrinking a photo, converting CSV to JSON. Each tool does one job and has a page explaining that job.
No account, no membership, no email address asked for. You open the page, drop your file in and download the result.
Why it runs in the browser
Most conversion sites upload your file to their own server, process it there and let you download the result. For an ID scan, an invoice or a private photograph that is an uncomfortable arrangement: your file now sits on someone else's disk.
Here the browser does the conversion itself. Modern browsers already decode images, draw to a canvas, produce JPEG, PNG and WEBP, and parse text; the only missing piece was putting those capabilities behind a decent interface. The result: your file never leaves your computer, work starts immediately with no queue, and the tool keeps working while the page is open even if your connection drops.
There is a cost and we do not hide it. On very large files the work lands on your device, and some conversions that genuinely need a server — extracting images from a PDF, for instance — cannot be offered here. Rather than fake a conversion we cannot do, we leave it off the list.
How it is built
The site is entirely static; the pages come out of a generator script. No external library, framework or CDN is used — even the PDF writer was written by hand, embedding JPEG data straight into the document and computing the object table manually.
That has a visible benefit: pages load light, no third-party script watches you, and there is no address your file could be sent to. The short code in the footer shows which build the page was published from.
Who builds it
The site is built and maintained by Ahmet Bilgiç. Suggestions and bug reports go to info@arackosesi.com.
The approach behind every tool here is the same one: finish the job on the visitor's own device and then get out of the way.
You can also follow development notes and new tool announcements on Instagram.
New tools
New converters are added to the list regularly. If the conversion you need is missing, write through the contact page: if it can be done in the browser with plain JavaScript it goes into the queue, and if it cannot, you get told why.
Last updated: July 30, 2026