More often than average, yes. Form changes — removing fields, reordering them, restyling them — win 12% of the time, one of the higher published rates. The oldest advice in conversion optimisation holds up better than most of the newer advice.
Worth doing, with the caveat that a shorter form can move a worse-qualified lead downstream, and a conversion metric will not show you that.
| Tests analysed | 50+ |
| Beat control | 12% |
| No measurable difference | 70% |
| Lost to control | 17% |
| Median lift when it won | +71.1% |
Typical winning range: +23.6% to +204.5% for the middle half of winners. Median traffic per variant was 1420 visitors. Most ran on homepages (28), lead capture pages (15), landing pages (12).
Fields are added, removed, reordered or restyled. The form's purpose and destination stay the same.
Adjacent categories, and how often they win: layout (15%), hero image (12%), styling (11%).
The product block content was replaced with a size help link that opened a popup with sizing guidance.
It replaced the numeric quantity input with a styled 1-10 dropdown selector and hid the original price display.
The two-column contact info form was replaced with a single-column multiple-choice question, and the image was removed.
It replaced the checkbox with a tap-to-consent button, rewrote the subtitle and disclosure text with a dynamic document name, and swapped the static phone image for a live animated phone bubble.
It added a consent disclaimer with terms and privacy links below the checkout button, hid the terms checkbox row, and set that checkbox to be checked automatically.
It replaced the quantity input with plus and minus buttons on mobile or a styled dropdown on desktop, hid the base price display, and restyled the price and benefit list elements.
The plain notice text was replaced with a route search form that used dropdowns and a primary CTA in the hero area.
The form hid all vehicle finder fields except the make dropdown until a make was selected, then showed the model dropdown and added numbered step labels to the fields.
The email field placeholder text changed, the address field was relabeled, a collapsible manually enter address section was added, some address labels were hidden, and checkout form elements were restyled.
These are individual tests, not rules. Each ran on one site, with one audience, against one page we are not showing you. They are picked to be illustrative rather than sampled at random, and a change that won here can lose on your page for reasons none of this captures. Read them as prompts for what to test, not as findings to copy.
A field is work. Removing one removes work from every single person who reaches the form, which is a broader intervention than changing something only some visitors read.
| change type | win rate | tests |
|---|---|---|
| CTA colour | 16% | 32 |
| Layout | 15% | 351 |
| Form (this page) | 12% | 81 |
| CTA copy | 12% | 315 |
| Hero image | 12% | 160 |
| Price framing | 11% | 117 |
| Styling | 11% | 1414 |
| Split URL | 10% | 1165 |
| Headline | 8% | 918 |
| Social proof | 8% | 196 |
| Body copy | 6% | 337 |
A win rate only means as much as the thing being counted, so this is what these tests were actually optimising for.
| measured outcome | share of tests |
|---|---|
| Purchase / order complete | 48% |
| Lead / form submission | 27% |
| On-page click / engagement | 6% |
| Signup / registration | 5% |
Outcomes below 5% of the set are not listed, so these do not sum to 100. How the outcome was measured moves the win rate a lot — see the methodology.
These rates are not like-for-like. How often a test wins depends partly on what it chose to measure: a goal that records a soft signal — a click, a scroll — clears the bar more often than one that records a purchase. Across this data, tests measured against a proxy goal win 13%, against 9% for tests measured against a business outcome.
Categories differ a lot in that mix — proxy goals account for anywhere from 2% to 41% of a category's tests, and form tests sit at 21%.
Hold the metric fixed and the spread narrows sharply. Comparing only tests measured against a business outcome, the gap between the highest and lowest category falls from 9 points to 6 — at which point the intervals overlap and the categories are not statistically distinguishable.
So read the table as a description of what happened, not as a ranking of what works. If you want the comparison to mean something, compare categories that were measured the same way. The methodology page has the full breakdown.
The tests here do not support a number. What they support is that field count is worth testing at all, which is more than can be said for several better-known tactics.
It can, and a conversion goal cannot tell you. If lead quality matters, decide before you launch how you will check it, because the test itself will not.
This is every Mida account that ran a readable test — in-house marketers, founders, product teams, and agencies working on client sites. Nothing here is filtered by who ran the experiment or how experienced they are.
Low win rates are normal in experimentation, including at the top end. Microsoft's experimentation team, reporting on its own platform, found that only about one third of ideas improve the metric they were designed to improve — and that roughly another third actively hurt it. That is a dedicated experimentation organisation with research, prioritisation and review behind every test.
A mixed population like this one runs below that. The gap is roughly what disciplined practice buys you: ideas grounded in research rather than opinion, one variable at a time, and tests built so the result can actually be read.
So treat these as a general base rate, not a target. If you would rather not close that gap the slow way, find a CRO agency in the United States, the United Kingdom, the Netherlands or Australia — or browse every region.
A win is a variant that beat its control on that test's primary goal with a statistically significant result. Tests that never got enough traffic to say anything either way are excluded. The methodology has the full detail, including what these numbers cannot tell you.
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