Who is Font Swapper for?

Font Swapper is a consumer product built for font designers and web designers.

Does Font Swapper have a free plan?

Yes — Font Swapper is free to use.

What platforms does Font Swapper run on?

Font Swapper runs on the web, embeddable surfaces, and Android.

Is Font Swapper still maintained?

Unverified. Font Swapper has not been re-checked since it entered the index, so there is no finding either way — and only a positive finding would say otherwise.

What projects are similar to Font Swapper?

Similar projects tracked by PulseGate include Font Swap, FontSpy, and Font Changer.

Who makes Font Swapper?

Font Swapper is developed by KeyOuts.

When did Font Swapper launch?

Font Swapper first shipped in 2025.

Back to the index

Font Swapper

Name: Font Swapper
Author: KeyOuts

mozilla.orgBrowser DevTools & extensions

Font Swapper is a Firefox extension for font designers to upload fonts and preview them on any webpage. It provides controls for font size, color, line spacing, and character spacing, and saves fonts locally for reuse.

FreeWebEmbeddableAndroid

Visit mozilla.org

1alternative

7features

2025since

Overview

7 features

Font Swapper sits in PulseGate's Browser DevTools & extensions category. It focuses on previewing and tuning custom fonts on live webpages without repeatedly editing website code. Font Swapper is a consumer product aimed at font designers and web designers. Font Swapper costs nothing to use. It runs on the web, embeddable surfaces, and Android.

KeyOuts builds and maintains Font Swapper, and it first shipped in 2025. Key capabilities include font uploading, webpage font preview, and font size control. The interface is available in 32 languages, including Czech, German, and Greek.

Summary written by a language model from the project’s public pages.

Font uploading
Webpage font preview
Font size control
Color control
Line spacing control
Character spacing control
Local font storage

Built with & integrations

Runs on

BrowserEmbeddableAndroid

Trust & compliance

Verified signals

HTTPSPrivacy Policy Terms of ServiceFree tierMulti-languageStore-verified publisher

Legal

Indexing history

What PulseGate has recorded for this listing

Indexed18 Sep · 09:49 UTC
Font Swapper verified via Firefox Add-ons
Source: Firefox Add-ons · Open

Frequently asked questions about Font Swapper

What is Font Swapper?: Font Swapper focuses on previewing and tuning custom fonts on live webpages without repeatedly editing website code. It is catalogued under Browser DevTools & extensions on PulseGate.
Who is Font Swapper for?: Font Swapper is a consumer product built for font designers and web designers.
Does Font Swapper have a free plan?: Yes — Font Swapper is free to use.
What platforms does Font Swapper run on?: Font Swapper runs on the web, embeddable surfaces, and Android.
Is Font Swapper still maintained?: Unverified. Font Swapper has not been re-checked since it entered the index, so there is no finding either way — and only a positive finding would say otherwise.
What projects are similar to Font Swapper?: Similar projects tracked by PulseGate include Font Swap, FontSpy, and Font Changer.Font Swap FontSpy Font Changer
Who makes Font Swapper?: Font Swapper is developed by KeyOuts.
When did Font Swapper launch?: Font Swapper first shipped in 2025.

At a glance

Pricing: Free
Platforms: Web
Built for: font designers and web designers
Model: B2C
Solves: Previewing and tuning custom fonts on live webpages without repeatedly editing website code.

Registered as

Firefox Add-ons: fontswapper

Developer

KeyOuts

Index record

Indexed: 18 Sep 2026
Lifecycle: Alive
Last seen: 18 Sep 2026

Identity audit (13)

Slug: font-swapper-mozilla-org
Lifecycle state recorded: 18 Sep 2026
Verification state: Indexed for public listing
Listing state: Listed: yes
Index status: Included in index
Latest evidence snapshot: 18 Sep 2026
Timeline basis: Indexed-at chronology. This listing's first-seen date was written by the catalog backfill, not observed here, so it is not treated as a sighting.
Name from: Derived from the project's own page and URL.
Category from: Assigned by a language model.
Summary from: Written by a language model from public pages.
Languages from: Detected by a language model, checked against the page's own declaration.
Last updated: 18 Sep 2026
Canonical URL: https://addons.mozilla.org/en-US/firefox/addon/fontswapper

Ship this? Send a correction — no account, and you get a link to follow it.

Similar projects

Closest matches by what these projects do