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LightUtils
36 file tools that physically cannot upload your files
Every other free PDF tool uploads your file and promises to delete it later. LightUtils cannot upload it. The site ships a Content Security Policy with connect-src 'none', so the browser itself forbids this page from making any network request. Verify it in DevTools in ten seconds. 36 tools for PDF, image, video, audio and CSV. No account, no watermark, no daily limit, no size cap, because there is no server cost per file. Full English and Thai.
I run a small software studio in Bangkok. Last year a client asked us
to help their HR team merge some PDFs. Payroll files. We told them to
use one of the usual free sites, and their compliance officer said no.
She was right. Those files were not allowed to leave the building.
That is when I noticed the pattern. The people who need free file
tools the most are the ones least allowed to use them. Accountants,
HR, hospitals, law firms. Every tool in this category answers that
with a promise: "we delete your file after two hours." A promise is
not a control.
So I built LightUtils around a constraint instead. The site sends a
Content Security Policy with connect-src 'none'. That is a browser
enforced rule saying this page may not make a network request, to
anywhere, for any reason. Even if my own code tried to upload your
file, the browser would refuse. Open DevTools, run a tool, watch the
Network tab stay empty.
The constraint made everything harder and better. No server means no
ffmpeg, so trimming a video is hand-written MP4 parsing plus
WebCodecs. No server means no cost per file, which is why there is no
account, no watermark and no daily limit. It also forced me to care
about memory: an early version of the batch image-to-PDF tool held
every decoded bitmap and peaked at 1.5 GB of RAM. Now every batch
tool processes one file at a time, and I measure the browser's
process memory before shipping anything.
It is bilingual, and the Thai is not a translated interface. Thai
tone marks survive filenames, Thai CSVs that Excel turns into
mojibake get repaired, Thai text sorts in dictionary order. Nothing
else in this category bothers.
36 tools, zero dependencies, nothing collected. Happy to answer
anything, especially if you try to break it.
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About LightUtils on Product Hunt
“36 file tools that physically cannot upload your files”
LightUtils was submitted on Product Hunt and earned 3 upvotes and 1 comments, placing #155 on the daily leaderboard. Every other free PDF tool uploads your file and promises to delete it later. LightUtils cannot upload it. The site ships a Content Security Policy with connect-src 'none', so the browser itself forbids this page from making any network request. Verify it in DevTools in ten seconds. 36 tools for PDF, image, video, audio and CSV. No account, no watermark, no daily limit, no size cap, because there is no server cost per file. Full English and Thai.
LightUtils was featured in Design Tools (261.8k followers), Productivity (658.2k followers) and Privacy (11.3k followers) on Product Hunt. Together, these topics include over 202.5k products, making this a competitive space to launch in.
Who hunted LightUtils?
LightUtils was hunted by Limpornchai Limkittikul. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
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Limpornchai Limkittikul