Browser Extensions for Auto-Fill Comping: The 2026 UK Guide

▍Browser Extensions for Auto-Fill Comping: The 2026 UK Guide

Let's start with the maths, because once you've seen it you can't unsee it.

A UK comper entering 30 competitions a day spends roughly 10-15 seconds typing the same name, email, address, postcode and phone number into a web form for each entry. Call it 12 seconds. Across 30 entries, that's 6 minutes a day. Across a year, that's 36 hours of your life typing the same six things over and over. Auto-fill collapses that 12 seconds to about 1 second. You get most of those 36 hours back.

For compers who enter more like 50 a day during peak periods (Christmas, Easter, back-to-school promo cycles), the saving is closer to 60-70 hours a year. That's a working week and a half you can spend either entering more comps or — radically — doing something other than comping.

This is the practical guide to browser extensions for auto-fill comping in the UK: what they do, which ones are worth installing, the Sweepzy Chrome extension (Premium feature, comping-specific), the built-in options in Chrome, Firefox and Safari, where password managers fit in, what you should never auto-fill, and the security stuff most articles skip.

▍What an auto-fill extension actually does

At the simplest level, an auto-fill extension watches every web form you encounter and recognises the standard contact fields — name, email, phone, address, postcode, date of birth. When you click a button (or, with some tools, the moment the page loads), it populates those fields with values you've saved once. You go from typing six fields to clicking once.

The better extensions go further:

• Smart field detection — recognises non-standard labels ("How can we reach you?" = email)
• Multiple profiles — switch between your own details and, say, your spouse's, with one click
• Selective filling — auto-fill the boring stuff but leave the comp-specific fields (slogan, tie-breaker, photo upload) untouched
• Comping-specific knowledge — recognises UK competition entry forms specifically and skips fields a generic auto-filler would get wrong (like asking for an answer to a validation question)

That last point is what makes the Sweepzy Chrome extension different from a generic password-manager auto-fill. It knows what a UK competition form looks like and is tuned for the specific patterns most aggregator-listed comps use. We'll come back to it.

▍The time-saving maths in detail

The quick "30 entries a day saves 36 hours a year" figure is the simple version. Here's the more honest breakdown for different comper profiles.

The other hidden saving: typos. When you're typing your postcode for the 28th time before lunch, you make mistakes. A wrong postcode disqualifies you silently — the promoter can't post you the prize. Auto-fill eliminates that whole category of failure. Our comping routine and time management guide goes deeper on why removing micro-frictions like typing matters more than people think.

▍The Sweepzy Chrome extension

The Sweepzy Chrome extension is a Premium feature built specifically for UK competition forms. The headline differences from a generic auto-filler:

• Tuned for UK comp forms — recognises the specific field labels and layouts that aggregator-listed UK competitions use, including the slightly weird ones from older promoter platforms.
• Connected to your Sweepzy account — auto-logs the entry to your Sweepzy competition tracker at the moment you submit, so you don't have to remember to update your tracker afterwards.
• Selective fill — fills name/email/address/phone/DOB but explicitly skips photo upload, validation question, and tie-breaker fields, because auto-filling those is how you get disqualified.
• Multiple profile support — switch between your own profile and a partner's profile in one click for the rare comps that allow household members to enter separately.
• One-click skip on competitor sites — won't auto-fill if you're on a known scam-comp site, based on a maintained blocklist.

It's Premium-only because the maintenance cost of keeping the field-detection rules current as promoters change their forms is non-trivial — that's funded by Premium subscriptions. The pricing is £5/month or £50/year (around 17% off annual), which works out to roughly £4.17 a month if you go yearly. For a comper entering 30 a day, that's about 8p per hour saved.

If you're not Premium yet, the alternative path is to combine your browser's built-in auto-fill with a password manager and a text expander, which gets you maybe 80% of the way there. We'll walk through how.

▍Browser built-in auto-fill: the free baseline

Every major browser ships with a basic auto-fill feature. None of them are designed for comping specifically, but all of them are good enough to be worth setting up properly before you do anything else.

Chrome auto-fill

Go to Settings → Autofill and passwords → Addresses and more. Add a complete address entry with:

• Full name (the one you use on official forms — Royal Mail needs to match)
• Full delivery address with correct postcode formatting (capitals, space)
• Phone number in international format if comps require it (+44 7...)
• Email address
• Add organisation only if you want to (most compers leave it blank)

Chrome will then offer to auto-fill any standard contact form. The catch: Chrome's field-detection is generic, so it'll fill fields it shouldn't (occasionally) and miss fields it should (occasionally). You get maybe 75% of the way there for free.

Firefox auto-fill

Go to Settings → Privacy & Security → Forms and Autofill. Enable autofill addresses and save your details. Firefox's detection is slightly stricter than Chrome's, which means fewer false fills but also a few comps where it doesn't trigger at all.

Safari auto-fill (Mac/iPhone)

Safari uses your macOS or iOS Contacts card as the source. Open Contacts, edit your own "My Card", and make sure name, address, phone and email are all filled in. Then in Safari → Settings → AutoFill, tick "Using info from my contacts". The advantage of Safari: it syncs perfectly across Mac and iPhone via iCloud, so the same auto-fill works on both.

Edge auto-fill

Edge uses the same engine as Chrome under the bonnet. Settings → Profiles → Personal info to configure. If you've used Chrome auto-fill before, the experience is identical.

▍Password manager auto-fill

If you already use a password manager (1Password, Bitwarden, LastPass, Dashlane, Apple Passwords, etc.), most of them include identity-fill features that work alongside or instead of the browser's built-in. The advantages over browser-native:

• Cross-browser — your details sync between Chrome on your laptop, Safari on your phone, Firefox on a different machine.
• Multiple identities — easier to store a primary and secondary set of details.
• Better field detection in some cases, especially Bitwarden and 1Password.
• Audit trail — some password managers log when they filled what, which is useful evidence if a comp dispute happens.

The downsides: the free tiers of most password managers limit identity-fill (or don't include it), and you're now trusting another company with a fuller picture of your personal data than the browser already has.

For compers who aren't ready to pay for Sweepzy Premium yet, Bitwarden free + Chrome auto-fill as a backup is the strongest free combination. Bitwarden handles identity-fill on comps where its detection works, Chrome catches the rest.

▍Text expanders for tie-breakers and slogans

Auto-fill handles the boring contact fields. Tie-breakers, slogans, "why do you love [Brand]" sentences and short creative responses are a different problem. You don't want auto-fill putting the same slogan into every comp (it's both lazy and likely against the spirit of the rules), but you do want quick access to your best phrasings.

Text expanders are the answer. You set up shortcuts that expand into longer text when typed. Examples:

• \addr → your full postal address
• \bio → a standard social-media bio you use for entries that need one
• \why1 / \why2 / \why3 → three different "why I love your brand" templates you can mix and match

The tools:

• PhraseExpress (Windows, free for personal use) — solid, lots of features
• TextExpander (Mac and Windows, paid) — most polished, syncs across devices
• Espanso (free, cross-platform, open source) — technical to set up but powerful
• Apple Text Replacement (iOS/macOS, built in) — basic but enough for short snippets
• AutoHotkey (Windows, free) — the developer's option

For 90% of compers, the built-in iOS/Mac Text Replacement feature is plenty. For Windows users, PhraseExpress is the safest pick. Anyone wanting to integrate text expansion with their full comping system should look at how it connects to their comping spreadsheet template or tracker for keeping a record of which slogan went to which comp.

▍Security: the bit nobody talks about

Giving any browser extension access to your contact details, address, phone and email is a trust decision. Most articles skip past this. Here's the honest version.

What an auto-fill extension can technically see

Any extension with permission to read form fields can, in principle, also read everything else on the page — including your saved login when you're checking your bank, the contents of your emails when you're in webmail, and the data on any other site you visit. The permissions model for Chrome and Firefox extensions is coarse: "read and change data on websites you visit" is the standard ask, and that means everywhere.

What this means in practice

• Only install extensions from publishers you can verify. Established password managers, the official extension from a service you already trust (e.g. the Sweepzy Chrome extension if you're a Sweepzy Premium user), and that's about it.
• Don't install random "comping auto-filler" extensions from unknown developers. Free Chrome extensions are bought and sold all the time — a benign extension can change hands and become a data-harvester overnight.
• Review your installed extensions monthly. Open chrome://extensions or about:addons and audit the list. Anything you don't recognise, anything you haven't used in three months, anything from a publisher you don't remember choosing — remove it.
• Check permissions before you accept. "Read data on all websites" is normal for auto-fill, but "manage your downloads" or "access your tabs" probably isn't.
• Keep the browser updated. Browser security patches matter more than people realise. Chrome's auto-update is on by default; don't disable it.

Why password manager extensions are usually safer than random auto-fillers

The established password managers (1Password, Bitwarden, Dashlane, LastPass) have professional security teams, regular third-party audits, and a business model that depends on not being breached. Random comping-specific auto-fillers don't. If you're going to install one extension, pick from the trusted list.

Why Sweepzy's extension is different

It only activates on competition entry pages it recognises, not every page you visit. The data it accesses (your saved comping profile) is the same data already in your Sweepzy account, so there's no extra trust transfer — you'd already given Sweepzy that information to use the tracker. And it's published, maintained and audited by the same company that runs the platform you're using.

▍What you should NEVER auto-fill

This is the bit that disqualifies compers who get over-eager with auto-fill. Some fields you must do manually, every time.

CAPTCHA

Obviously. If an extension auto-fills CAPTCHA, it's either broken or fraudulent. The whole point of CAPTCHA is that humans solve it. Most competition T&Cs explicitly forbid automated entry, and auto-solving CAPTCHA crosses that line.

Validation questions

Many UK competitions include a "prove you're a human" multiple-choice question ("What colour is the sky?", "Which of these is a fruit — apple, car, table?"). These exist precisely to catch automated entries. Answer them manually. Some auto-fillers will helpfully fill them in with the wrong answer, which is the worst possible outcome — you submit a wrong answer, and you're disqualified silently.

Skill or tie-breaker questions

Slogans, "in 20 words tell us why you love X", photo captions, creative responses. These are the differentiating part of skill-based comps. Auto-filling the same answer across every comp is both ineffective (judges spot it) and against the rules of most skill comps (which require an original response per entry). Write them fresh, or use a text expander to bring up a template you then edit.

Photo or file uploads

No legitimate auto-filler should be touching file uploads. If one does, remove it immediately. Photo entries especially need to be the actual entry you intended — auto-fill cannot help.

Free-text "any additional information" fields

Some comps include an optional comments box, and auto-fillers occasionally try to put your address in it. Always check the page before you submit — auto-fill failures here look strange and can flag your entry as suspicious.

Anything age- or eligibility-related

Your date of birth is fine to auto-fill if you genuinely are 18+. But fields like "are you a UK resident over 25?" or "do you have a driving licence?" need a real answer every time, because the answer affects eligibility.

▍Mobile auto-fill: the picture is different

Most UK compers do the majority of their entering on mobile in 2026. Browser extensions in the traditional sense don't exist on mobile Safari, mobile Chrome on iOS, or most mobile browsers — Apple and Google deliberately restrict the extension API.

What does work on mobile:

• iOS AutoFill — uses your Contacts card and saved passwords. Tap the suggested email/address bar above the keyboard.
• Android Autofill service — set in Settings → System → Languages & input → Advanced → Autofill service. Pick your password manager or Google.
• Native password manager apps — 1Password, Bitwarden etc. integrate into the OS-level autofill service.
• Keyboard text replacement (iOS Settings → General → Keyboard → Text Replacement) — for tie-breakers and slogans, set up shortcuts that expand when typed.

The Sweepzy Chrome extension is desktop-only currently. Mobile compers using Sweepzy get the tracker auto-log and analytics features, but the form-filling has to use iOS/Android native autofill.

▍Putting it all together: the recommended stack

For compers serious enough to want the optimal setup, here's what works:

Free tier

• Browser: Chrome with built-in auto-fill configured for full address
• Password manager: Bitwarden free, for backup auto-fill and to handle the comps Chrome misses
• Text expander: Built-in iOS Text Replacement (mobile) + PhraseExpress free (Windows) or built-in macOS Text Replacement (Mac)
• Tracker: Free Sweepzy account for entry logging

Paid stack (Sweepzy Premium)

• Browser extension: Sweepzy Chrome extension for one-click UK-comp-form auto-fill that also auto-logs to your tracker
• Password manager: Same as free tier (Bitwarden) — you don't need to upgrade
• Text expander: Same as free tier
• Tracker: Sweepzy Premium for Mailbox auto-win-detection, full analytics, and leaderboard prize eligibility

For a comper entering 30 a day, the paid stack saves around 33 hours a year on auto-fill alone, plus removes the inbox-checking time the Mailbox handles, plus gives you the analytics to actually improve your strategy. The £50/year (~17% off annual) Premium cost equates to under £1 a week.

For the wider context on what tools actually move the needle for UK compers, our essential comping tools and resources round-up covers everything from auto-fill to spreadsheets to community forums. And if you're still working out your overall approach, the ultimate guide to comping is the single best starting point.

▍Common auto-fill mistakes (and how to avoid them)

Trusting auto-fill blindly. Always glance at the form before you hit submit. Auto-fill misfires occasionally. Two seconds of checking saves a wasted entry.

Using auto-fill for tie-breakers. Already covered above. Don't.

Installing five different auto-fillers "to see which is best". Pick one, stick with it, learn its quirks. Multiple auto-fillers fighting over the same form fields produces nothing but chaos.

Forgetting to update your saved address when you move. Every comp you enter for the next two years will go to your old house. Auto-fill is only as good as the source data — update it the day you move.

Auto-filling validation questions. Already covered above. Specifically dangerous because the answer is wrong and the form still submits.

Using one auto-fill identity for a comp that needs a different one. Some UK comps have age, region or demographic restrictions where you'd want a different family member to enter. Multiple-identity support (in either Sweepzy's extension or a good password manager) handles this — auto-fill the right person, not just the default one.

▍Bottom line

Auto-fill is the highest-leverage single change you can make to your comping setup. 30 minutes of configuration saves dozens of hours a year and eliminates an entire class of typo-related disqualifications.

The free version (browser built-in + a free password manager + a text expander) gets you maybe 80% of the way there. The paid version (the Sweepzy Chrome extension plus a free password manager) gets you the rest, plus the integrated tracker auto-logging, plus comping-specific field intelligence that generic tools don't have.

Pair it with a proper tracking system and you've cut the friction in your comping by an order of magnitude. Time you'd have spent typing your postcode is now time spent entering more comps — or, more sensibly, doing something else with your evening. Start with a free Sweepzy account, get your tracker set up, then layer auto-fill on top.