delphitools — a collection of small browser tools that run locally

• delphitools

  This page

  Pricingdelphitools leads

  • Free with no account and no paywall at any tier
  • Open source under the 0BSD licence — fork it, host it, sell it
  • No ads, no upsell, no data collection to fund it

• Squoosh

  Pricingdelphitools leads

  • Free and open source, no account
  • No paid tier to upgrade into
  • A single-purpose tool, so there is nothing to upsell

• CloudConvert

  Pricingdelphitools leads

  • Free tier metered by a daily conversion allowance
  • Credit packs and subscriptions above it
  • Per-file or per-minute charges at the top end

• iLoveIMG

  Pricingdelphitools leads

  • Free tier capped by file size and batch count
  • A premium subscription lifts the caps
  • Ad-supported underneath the free path

1. delphitools — official site
2. delphitools — source code and licence
3. delphitools — Substrata, the browser image editor
4. delphitools CLI — command-line edition
5. delphitools for iOS — App Store listing
6. Squoosh — official site
7. CloudConvert — official site
8. iLoveIMG — official site

Free tier

Yes

Pricing summary

There is no pricing table to read, because there is no paid tier: the site states plainly that there are no logins, no paywalls and no data collection, and it has kept that promise through the 2.x releases. Every tool is available without an account, and nothing asks you to upgrade partway through a job. The project is released under the 0BSD licence, which is about as permissive as an open-source licence gets — it places essentially no conditions on what you do with the code, including running your own copy. That matters beyond ideology: if you work somewhere that cannot send client files to a third-party service, you can host this yourself and satisfy both the licence and the policy. The only costs the project asks you to carry are indirect — the browser memory that in-browser processing consumes, and the fact that support is community-shaped rather than a service contract. Because there is no commercial relationship to change, the pricing risk here is close to zero; the terms worth checking over time are in the GitHub repository rather than on a billing page.

Reviewed on 19 September 2026 · delphitools — source code and licence

• One drop target that routes the file for you

  The home page is itself the most useful feature: drag a file onto it, or paste one from the clipboard, and it works out which of the tools you probably want. There is also an "I'm feeling lucky" button and a shuffle control, which sounds like a gimmick until you use it as a way of discovering that the tool you have been doing by hand already exists here. Search across the index does the same job when you already know the name of the operation rather than the file type.

• Around a hundred tools, sorted into twelve categories

  The index is grouped rather than dumped in one list: Colour, Images & Assets, Audio & Video, Typography & Text, PDF, Print & Production, Dev Tools, Other Tools, Calculators and Turbo-nerd Shit, with a Greatest Hits shelf on top for the ones people actually use. The counts are lopsided in a way that reads as honest rather than accidental — Images & Assets is the largest group and Print & Production the smallest, which is roughly the shape of the demand.

• Local-first processing as the default, not a setting

  The whole collection is built around work happening in the tab: the project's own framing is no logins, no paywalls and no data collection, with everything running locally in the browser. That single decision is what turns a grab-bag of utilities into something you can use for client work — a metadata stripper is only useful if the file it strips is not uploaded first, and a contrast checker for an unreleased design system is only safe if no one sees the palette.

• Colour tooling that goes past a palette picker

  The Colour group is eleven tools deep and leans on the parts of colour work designers actually get stuck on: a converter across formats, a WCAG contrast checker, a colour-blindness simulator, a harmony generator, a palette extractor that samples a reference image, a zoom-loupe pixel picker and a Tailwind shade generator for producing a full scale from one base. There is also a Colour Atlas that gathers everything the site knows about a single colour onto one page.

• Images and assets without a design application

  The Images & Assets group is the widest set, and it is aimed at the jobs you would otherwise open a full editor for: compress to JPEG, WebP, PNG or AVIF, convert across PNG, JPEG, WebP, JXL, GIF, BMP, TIFF, ICO and ICNS, strip EXIF and GPS metadata, trace a raster into SVG, optimise the SVG afterwards, generate favicons and placeholders, trim transparent edges, split and stitch images, or cut them into shapes. Substrata, the browser image editor, sits on the same shelf for the jobs that need arranging rather than converting.

• Audio, video and subtitle handling in the same tab

  The A/V group covers extraction, trimming, muting, compressing to GIF, pulling frames, recording a screen or a voice, converting subtitle formats and building waveforms — plus Auto Subtitle, which transcribes audio and video into subtitles so you are not paying a separate service per video. For anyone producing short-form video, having the frame grabber, the audio extractor and the subtitle converter in one place removes three separate uploads from every edit.

• Print and production tools that are genuinely rare online

  This is the least expected group and, for a lot of studios, the most useful: PDF preflight, PDF organiser, page numbers, rotate and crop, a PDF compressor, images-to-PDF, and then the two production tools most web utilities ignore entirely — a print imposer for booklet and signature layouts and a zine imposer for folding formats. Alongside them sit paper sizes, a typography calculator, PX-to-REM and a line-height calculator, which together cover the last mile before something goes to a printer rather than a screen.

• A developer and nerdier tail, kept in the same product

  Dev Tools adds the small things you would otherwise open a browser tab for anyway: a cron builder, an HTTP status reference, a JSON formatter, a JWT decoder, a regex tester, a request builder, a meta tag generator, a UUID generator and a Tailwind cheat sheet. Underneath that, Turbo-nerd Shit collects Braille, IPA transcription, Morse, NATO phonetic and Shavian transliteration — genuinely unnecessary, and a fair signal that this is a project built by someone scratching their own itches rather than assembling a content farm.

• The same jobs on the command line and on a phone

  Two editions sit outside the browser: a CLI published from its own repository for scripting the same operations, and an iOS app for the jobs you want to do away from a desk. Neither is required to use the site, but together they mean the collection is not locked to one surface — a useful property if you want the desktop version for bulk work and the phone version for a quick crop.

1. 1

   Start by dropping the file, not by browsing

   The fastest path in is the home page drop target or the clipboard paste — hand it the file and let it choose. That inverts the usual workflow, where you decide what you need, then search for a site, then hope it handles your format. Browsing the categories is the second-best entry and the better one when your job is not file-shaped at all, like building a Tailwind scale or generating a UUID.

2. 2

   Check that what you are about to do is a conversion, not an edit

   Be honest with yourself about which one you want. If the answer is "make this file smaller / a different format / free of metadata / a different shape", you are in the right place. If the answer involves layers, masks that you will revisit, a history you can undo through, or a look you are still iterating on, Substrata or a desktop editor is the correct next step and this collection will frustrate you.

3. 3

   Use the atlases when you are diagnosing rather than producing

   The Image, Video, Audio and Colour atlases exist to answer "what is actually in this file", and they are the tools that most often save a wasted afternoon. Before you compress something that will not compress, or wonder why a client's JPEG has a colour cast, or chase a subtitle that is out by a fraction of a second, open the corresponding atlas and read the metadata instead of guessing.

4. 4

   Chain the tools when one job has several steps

   Download is a fine hand-off, but a lot of real work is two or three steps: trace a raster logo to SVG, optimise the result, then generate the favicon set from it. Keep the intermediate file and move straight to the next tool rather than starting a new search — the index makes that cheap, and the Workflows tool exists specifically for stitching multi-tool procedures together into something repeatable.

5. 5

   Reach for the CLI or the app when the job repeats

   Once you notice you are doing the same three operations every week, the browser tab is no longer the right surface. The CLI puts the same operations in a script, which is the difference between compressing a folder by hand and compressing it on every build. The iOS app covers the same ground when the file arrives on your phone instead of your laptop.

• Designers with a small, specific file problem

  Most of design work is not in a design application — it is trimming the transparent padding off an export, producing a favicon set, sampling a colour from a reference image, checking a contrast pair, or turning one brand colour into a usable scale. Those are exactly the jobs the Colour and Images groups cover, and doing them without opening a full editor, signing into anything or uploading a client asset is the whole point.

• Front-end and design engineers

  The overlap of image pipeline, colour science and Dev Tools is the tell that this was built by someone shipping front ends: WebP and AVIF compression next to a Tailwind shade generator and a Tailwind cheat sheet, with a PX-to-REM converter, a regex tester and a JWT decoder in the same index. It reads as a drawer of tools for the person who owns the last mile before a page deploys.

• Anyone handling files under a confidentiality constraint

  Agencies, in-house teams, healthcare, legal and public-sector work all share one problem: the quickest tool for the job is usually a website that wants an upload, and the file is not allowed to go anywhere. Because processing happens in the tab and no account exists to tie anything to you, this collection is one of the few realistic answers — and because the licence is permissive, a cautious IT department can host its own copy rather than granting an exception.

• Small studios and solo print work

  Print production tooling online is thin, because the volume of people who need to impose a booklet is tiny next to the people who need to compress a JPEG. The PDF and Print groups cover preflight, imposition, zine folding, paper sizes and page numbering, which makes this genuinely serviceable for a studio running small print runs or a designer preparing files for a local printer without buying imposition software.

• The privacy-minded and the permanently curious

  The Calculators and the deliberately silly Braille, Morse, IPA and Shavian converters are the honest tells of a project built for its own pleasure. If you enjoy having a stocked drawer of small tools — and enjoy that a tool collection can be open source, free and ad-free at the same time — this is aimed at you, and the shuffle button is designed to be browsed rather than searched.

A web collection with two companion editions

The primary product is a browser application at delphi.tools. Alongside it the project publishes a CLI from its own repository and an iOS app through the App Store. The browser edition is the reference implementation and the one with the fullest index; the CLI lags by design, since it packages the scriptable subset of the same operations.

Licensed 0BSD, and genuinely open source

The code is public on GitHub and released under the 0BSD licence, which permits use, modification and redistribution with no attribution requirement and no copyleft obligation. In practical terms that means you can fork it, run your own instance behind a company firewall, or fold pieces of it into another product without negotiating anything. Version 2.1.0 was current at review time, with the 2.0 line running back through a sequence of point releases.

Local-first, which is a constraint as well as a promise

Doing the work in the tab is why the collection can be free and accountless, but it also sets the ceiling. Large files are bounded by the memory your browser will give a page rather than by a server farm, batch throughput is whatever your machine can do, and the heaviest jobs — transcription, background removal, the image atlases — depend on models and decoders being downloaded to the client. That trade is the product, not a defect to work around.

Built on an unusual front-end stack

The interface is built with Ember together with Crayon for the design layer, shadcn and Lucide for components and icons, and a long tail of other open-source libraries. It is a notably unfashionable choice for a 2020s web app, which fits the project's stated affection for the handmade web — and it also means the codebase is worth a look in its own right if you are evaluating it for self-hosting.

What the collection deliberately is not

There is no editor with layers, no undo history across sessions, no batch queue, no cloud storage, no review links and no team workspace. It does not try to replace a design application, a DAM or a conversion API. Most of the tools take one file in and produce one file out, and the ones that do more than that — Substrata for arranging images, Workflows for chaining procedures — are explicitly sketches rather than finished suites.

The numbers at review time

When we reviewed it the index carried twelve categories plus a Greatest Hits shelf and an Elsewhere group, and the counts ran roughly: Images & Assets the largest, then Audio & Video, Colour and Typography & Text all in double figures, with PDF, Print & Production and the calculator and nerd groups behind them. Individual tools are added between releases, so treat the category counts as the current shape of the collection rather than a fixed figure.