Is it safe to migrate your Altium project to KiCad?
Short version: usually yes — for a modern project, and only if you verify the result instead of trusting that it opened. The risk isn’t a migration that fails loudly. It’s one that succeeds quietly while leaving nets, rules and design intent behind. Here’s exactly what to check.
Is migrating from Altium to KiCad safe? A straight answer.
Usually yes. A modern Altium project can move to KiCad — KiCad has imported schematics, boards and libraries since KiCad 7, and whole projects since 9.0.3. It’s safe when the result is verified, not merely when it opens.
A standard migration can silently drop net-class membership, design rules, bus connectivity, multi-channel designators and other design intent — each documented in KiCad’s own public issue tracker. The board opens; the losses are quiet.
KiCad 10.0.6 (2026-08-29). Migration behaviour changes almost every release, so any “is it safe” answer is version-specific — this page is dated and refreshed per release.
For HDI stackups and advanced high-speed / signal-integrity work, KiCad still trails Altium. There the safe call may be to stay in Altium, or to migrate knowing what you’ll rebuild.
Below: what a standard migration can lose (with the KiCad issue that proves each one real), where KiCad still lags, and how to migrate without the surprises.
A file that opens isn’t proof the design survived.
The anxiety behind “is it safe” is legitimate. A standard Altium → KiCad migration almost always produces a project that opens — so it looks done. But “opens” and “correct” are different claims. KiCad’s own documentation lists elements it doesn’t carry across, and its public tracker records specific, reproducible losses: nets that arrive disconnected, rules that constrain nothing, channel suffixes stripped off designators. None of it throws an error. That’s the real risk — not failure you can see, but loss you can’t.
The danger isn’t the migration that fails. It’s the one that quietly succeeds.
What can a standard Altium → KiCad migration silently leave behind?
Net-class membership so your rules constrain nothing; design rules that have to be rebuilt by hand; multi-channel suffixes stripped into duplicate references; fills, keepouts and layers that change without an error; older ASCII boards imported as nothing at all. Each one is documented in KiCad's public issue tracker and scoped to the versions it affects. The ranked index is one page, kept current per release — this page's job is what you do about it.
When might the safe answer be “not yet”?
Migrating safely is one question; whether KiCad is the right home for your design is another — and here the honest answer isn’t always yes. KiCad has closed most of the historic gap and is a genuinely professional tool. But for the most demanding work it still trails Altium: HDI / high-density-interconnect stackups, and advanced high-speed and signal-integrity constraint modelling — Altium’s xSignals-class length-matching and impedance workflows have no full KiCad equivalent yet. If your board leans on those, the safe move may be to keep it in Altium, or to migrate with clear eyes about what you’ll rebuild and re-verify.
KiCad has closed most of the historic distance, but four capability areas still favour Altium today. If your board leans on any of them, factor the rebuild — or the decision to stay — into “is it safe.”
Advanced high-speed / xSignals
KiCad has differential pairs and length tuning, but no equivalent to Altium’s xSignals — grouped, topology-aware impedance and length-matching across series components. On DDR, SerDes and tight-timing RF designs, that constraint intelligence has to be managed by hand.
capability comparison: KiCad diff-pairs & length tuning are documented in KiCad docs; the grouped xSignals-class workflow has no full KiCad equivalent yetHDI / advanced stackup
KiCad defines board stackups and supports blind, buried and micro-vias — but advanced HDI detailing such as back-drilling and defined via-in-pad fill and capping still lags Altium. High-layer-count HDI boards may need parts of the stackup and via scheme rebuilt or documented outside KiCad.
capability comparison: KiCad stackup / via support is documented in KiCad docs; the advanced-HDI detailing gap is a known parity differenceRigid-flex
KiCad has no native rigid-flex board definition — flex regions, bend areas and per-region stackups aren’t first-class design objects the way they are in Altium. Rigid-flex projects are among the least portable, and are often the case where staying in Altium is the honest call.
capability comparison: rigid-flex board definition is not a supported KiCad feature (KiCad docs / feature status)MCAD integration
Altium offers bidirectional ECAD↔MCAD co-design that links the board to mechanical CAD live. KiCad exports 3D board models (STEP / IDF / VRML) for mechanical review, but has no round-trip co-design loop. Enclosure-tight designs that depend on that back-and-forth lose the workflow, not just a file format.
capability comparison: KiCad’s STEP / IDF / VRML export is documented in KiCad docs; bidirectional MCAD co-design has no KiCad equivalent
None of this puts KiCad’s professional standing in doubt — it’s shipped in production by companies, research labs and open-hardware teams worldwide. The point is narrower and more useful: Altium leads in these specific advanced areas, not across the board. That’s also the honest reply to any “KiCad isn’t production-ready” framing — it’s ahead here, not everywhere.
We tell you this because a decision guide that only ever says “yes, go” isn’t a decision guide.
How do you migrate an Altium project to KiCad safely?
A safe migration is a verified one. Six steps, in order:
- 01Confirm it’s a modern project
Check the files are modern Altium — version 6 or later (.PrjPcb / .PcbDoc / .SchDoc). A standard import can take in a pre-V6 file, or the ASCII text form, as nothing at all with no error (KiCad #18467), so identify them before you start, not after.
- 02Keep the Altium source as your ground truth
The original is the reference a migration has to match. Never overwrite it; you’ll compare against it.
- 03Migrate the whole design, not just the board
Schematic, board, libraries and the rule set — a board that came across cleanly can still sit on a schematic or rules that didn’t.
- 04Don’t verify by eye
A 3D render or a visual diff can’t see a dropped net-class membership or a stripped channel suffix. Account for every net, rule and sheet against the source — mechanically, not visually.
- 05Rebuild what doesn’t transfer
Treat design rules as something to reconstruct and re-check, not assume: widths, clearances and via rules commonly don’t carry across.
- 06Get evidence before fabrication
Have a documented account of what’s verified, what changed, and what still needs a decision — before you commit the board to a run.
What should you check after importing an Altium project into KiCad?
A migration that opens still has to be verified element by element. This is the checklist engineers run by hand after an import — and every item on it is something a standard migration can drop in silence. Run it against your Altium source, not against a 3D render. Each check below is one Crosspad performs automatically and records in an evidence report: what matched, what it repaired, and what it’s flagging for a decision.
What the free analysis checks on your .PcbDoc today
- 01Nets & connectivity
Did every net survive the import, and is each one still connected?
Net counts can match while individual nets arrive split, and a routine copper refill can silently break a connection — none of it visible in a 3D view.
documented: KiCad’s issue trackerCrosspad reconciles every net and connection back to the Altium source and records any that don’t match.
- 02Net classes & design rules
Did your net-class assignments and design rules carry over, or do they now constrain nothing?
Rule categories can import while the nets that belong to them are dropped, and widths, clearances and via rules often have to be rebuilt by hand.
documented: KiCad #15584Crosspad checks which nets still belong to each class and which rules actually transferred, and flags the gaps.
- 03Reference designators
Are your designators intact, with no duplicates from stripped channel suffixes?
Multi-channel suffixes can be stripped — C33A and C33B both collapse to C33 — producing duplicate references you won’t catch scanning a dense board.
documented: KiCad #24861Crosspad compares every designator to the source and surfaces duplicates and dropped suffixes.
- 04Copper fills & zones
Do your copper pours match the source — same fills, same relief, still connected?
Fill relief and zone parameters can change on import, and a refill can disconnect copper without a warning.
documented: KiCad #18408 / #15587Crosspad verifies pour coverage and zone connectivity against the source.
- 05
- 06Layers & board outline
Are all your layers mapped correctly, and is the board outline intact?
A layer with no clean equivalent can be remapped, and the outline can drop entirely — leaving a board with no edge.
documented: KiCad #17351 / #18756Crosspad checks the layer map and confirms the outline survived.
- 073D models & variants
Are your 3D / STEP models and assembly variants present?
3D models may not import at all, and project variables behind variant data can arrive as literal ${…} text instead of a value.
documented: KiCad #15058 (3D) / #24455 (variables)Crosspad records which 3D models and variant fields are present, missing, or unresolved.
What you still have to check by hand at launch
- 01Schematic hierarchy
Did your multi-sheet hierarchy reconstruct — every sheet and every cross-sheet connection?
Complex hierarchical schematics can fail to rebuild where simple ones come across fine, and flat multi-sheet designs can lose their structure.
documented: KiCad #20936Not at launch — the migration service takes a .PcbDoc board file, and there is no schematic in it. This one is yours to check by hand today; the schematics page documents how sheet and cross-sheet findings will be reported when schematic migration ships.
The point of the list isn’t to work through it by hand — it’s to make sure nothing on it is quietly assumed. Crosspad runs the board checks against your source and hands you the result, so “it imported” becomes “here’s exactly what survived, what was repaired, and what’s left for you to decide.” The schematic check stays yours until schematic migration ships, and this page says so rather than letting you assume otherwise.
Machine-verified evidence — not a 3D eyeball.
Step 4 is where most migrations quietly go wrong: the only “verification” on offer is opening the board and looking at it. Crosspad answers “is it safe” with evidence instead of opinion. It reads your Altium board directly, migrates it, compares the result back to the source semantically — every net, net class, rule, layer and copper connection — repairs what it can prove safe, and flags the rest. You get a report of what’s verified, what was repaired, and what still needs an engineering decision. Nothing disappears in silence. That covers step 4 for the board file; at launch the schematic half of the checklist above is yours, because the migration service takes a .PcbDoc board file and names .SchDoc as unsupported rather than billing for it.
A visual check can only find what you happen to look at. An account of every net, net class, rule and layer finds what you’d never think to check.
| OBJECT | SOURCE | TARGET | REPORTED AS |
|---|---|---|---|
| Nets | nets and pin connectivity read | all matched | VerifiedVERIFIED |
| Net-class membership | membership read | restored, then revalidated | Fixed and re-checkedREPAIRED_AND_REVALIDATED |
| Design rules | rule set read | mapped where a KiCad rule exists | Expressed differently in KiCadTRANSLATED_EQUIVALENTLY |
| Buses | shared-member buses read | connectivity needs a judgment | Needs your callENGINEERING_DECISION_REQUIRED |
| Legacy ASCII .PcbDoc | ASCII text form read | converted, then reconciled against an independent count | Fixed and re-checkedREPAIRED_AND_REVALIDATED |
| Pre-V6 (Protel) board | pre-Version-6 file | named unsupported, not skipped | Out of scopeUNSUPPORTED |
If Crosspad can’t verify a critical part of the migration, it doesn’t mark it safe.
Is it safe to migrate from Altium to KiCad? — the questions engineers ask.
Is it safe to migrate from Altium to KiCad?
Usually yes, for a modern project — and it’s safe when the result is verified, not merely when it opens. A standard migration can silently drop net-class membership, design rules, bus connectivity and other design intent, each documented in KiCad’s public tracker. Account for every net, rule and sheet against your source before you trust it.
What gets lost when you migrate Altium to KiCad?
Commonly: net-class membership (KiCad #15584), design rules, bus connectivity (#20707, ≤10.0.4), multi-channel designators (#24861), project variables (#24455), some copper fills and keepouts (#13750 / #18408 / #15587), certain layers (#17351 / #18756) and legacy ASCII files (#18467). Each is in KiCad’s own issue tracker. See our tracked failure modes.
Should I switch from Altium to KiCad?
For most standard PCB work, KiCad is a capable, professional target and switching is reasonable. Where KiCad still trails is HDI and advanced high-speed / signal-integrity design — if your work depends on those, weigh the switch carefully or plan to rebuild that part.
Is KiCad as good as Altium?
For a large share of designs, yes. The remaining honest gaps are HDI stackups and advanced high-speed / SI constraint modelling (Altium’s xSignals-class workflows have no full KiCad equivalent yet). Outside those, the difference is mostly workflow, not capability.
Will my Altium project import correctly into KiCad?
It will usually open — but “opens” isn’t “correct.” Whether it imported correctly depends on your specific nets, rules, buses and layers. That’s the question a project check answers against your actual source, rather than by eye.
Do Altium design rules transfer to KiCad?
Not reliably. Trace widths, clearances and via rules commonly don’t carry across and have to be rebuilt, and net-class membership can be dropped so the rules that do exist constrain nothing (KiCad #15584). Treat the rule set as something to reconstruct and verify.
Is it safe to migrate old or legacy Altium files?
Be careful, and split the two cases. A standard import can take in an ASCII or pre-V6 board file as nothing at all, with no error (KiCad #18467). Pre-Version-6 (Protel) boards are named as unsupported here. The ASCII text form is not: it is converted to the binary form and reconciled against an independent count of the board — and where the two disagree the board is named unsupported rather than migrated on a conversion we can’t vouch for.
How do I verify an Altium → KiCad migration is complete?
Not by looking at a 3D render — a visual check can’t see a dropped net-class membership or a stripped channel suffix. Verify it by accounting for every net, rule, sheet and connection against the original source. Crosspad does the board half of that mechanically — every net, net class, rule, layer and copper connection — and hands you the evidence; schematics are outside the launch scope and are named as unsupported.
What should I check after importing an Altium project into KiCad?
Check it element by element against your Altium source, not by eye: that every net survived and stayed connected, that net-class assignments and design rules carried over, that reference designators have no duplicates from stripped channel suffixes, that copper fills and keepouts match, that layers and the board outline are intact, that the multi-sheet hierarchy reconstructed, and that your 3D models and variant fields are present. A standard migration can drop any of these with no error. Crosspad runs the board half of that checklist automatically — nets, net classes, rules, designators, fills, keepouts, layers and outline — and records what matched, what it repaired, and what needs a decision; the schematic checks are yours at launch, because .SchDoc is outside the launch scope.
Is there a checklist for migrating from Altium to KiCad?
Yes — the post-import checklist above: nets and connectivity, net classes and design rules, designators, copper fills and zones, keepouts, layers and the board outline, schematic hierarchy, and 3D models and variants. Each item is a loss documented in KiCad’s public issue tracker, so confirming “the board opened” isn’t enough. Crosspad performs every check against your source and gives you an evidence report instead of a visual guess.
What can Altium still do that KiCad can’t?
Four areas favour Altium today: advanced high-speed constraint modelling (xSignals-class grouped impedance and length matching), advanced HDI stackup detailing such as back-drilling, native rigid-flex board definition, and bidirectional ECAD↔MCAD co-design. For most standard PCB work the gap is workflow, not capability — but if your board depends on one of these, weigh the switch carefully.
Who uses KiCad for professional work?
KiCad is used in production across industry, research institutions and open-hardware teams worldwide — it’s a genuinely professional tool, not a hobby-only one. Where it still trails Altium is a short list of advanced capabilities (high-speed / xSignals, advanced HDI, rigid-flex, MCAD co-design), not general professional readiness.
The safe answer is the one backed by your project’s evidence.
“Usually safe” is the answer for the average board. Point Crosspad at yours and get the specific one — what a KiCad migration keeps, what it changes, and what it flags for you.
Free analysis on one Altium .PcbDoc — one board file, not a project. Files are processed as described in our Security policy.