More often than average, yes. Form changes — removing fields, reordering them, restyling them — win 16% of the time, above the middle of the pack. 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 | 16% |
| No measurable difference | 67% |
| Lost to control | 17% |
| Median lift when it won | +21.4% |
Typical winning range: +9.3% to +39.1% 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 (19%), hero image (17%), styling (15%).
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 |
|---|---|---|
| Layout | 19% | 351 |
| Hero image | 17% | 160 |
| Form (this page) | 16% | 81 |
| CTA colour | 16% | 32 |
| Styling | 15% | 1414 |
| Price framing | 13% | 117 |
| CTA copy | 12% | 315 |
| Body copy | 11% | 337 |
| Split URL | 11% | 1164 |
| Headline | 10% | 918 |
| Social proof | 9% | 196 |
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.
Mida.so is a super lightweight A/B testing tool to help you experiment, analyze and implement conversion strategies in minutes.
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