diff --git a/src/bigos/cli.py b/src/bigos/cli.py
index 6b78d86..bb65325 100644
--- a/src/bigos/cli.py
+++ b/src/bigos/cli.py
@@ -81,7 +81,8 @@ def parse(
         else _BACKENDS[backend_name](cache=cache)
     )
     mime = mimetypes.guess_type(path)[0] or "application/octet-stream"
-    source = Source(uri=path.as_uri(), mime_type=mime, sha256=sha256_file(path))
+    abs_path = path.resolve()
+    source = Source(uri=abs_path.as_uri(), mime_type=mime, sha256=sha256_file(abs_path))
     t0 = time.perf_counter()
     doc = asyncio.run(backend.run(source))
     elapsed = time.perf_counter() - t0
diff --git a/tests/test_cli.py b/tests/test_cli.py
index e776d00..a59dea4 100644
--- a/tests/test_cli.py
+++ b/tests/test_cli.py
@@ -1,5 +1,6 @@
 from __future__ import annotations
 
+import os
 from pathlib import Path
 
 import pytest
@@ -31,6 +32,49 @@ def test_cli_unknown_format(tmp_path: Path) -> None:
     assert "Unknown format" in result.stderr
 
 
+def test_cli_relative_path_does_not_crash_with_value_error(
+    tmp_path: Path, monkeypatch: pytest.MonkeyPatch
+) -> None:
+    """Regression: ``bigos parse some/relative.pdf`` previously raised
+    ``ValueError: relative path can't be expressed as a file URI`` because the
+    CLI passed a non-resolved Path straight to ``Path.as_uri()``."""
+    from bigos import cli as cli_mod
+    from bigos.schema import Block, Document, Source
+
+    pdf = _minimal_pdf(tmp_path)
+    monkeypatch.chdir(tmp_path)
+    rel = Path(pdf.name)
+    assert not rel.is_absolute()
+
+    captured: dict[str, Source] = {}
+
+    class _StubBackend:
+        name = "stub"
+        version = "0"
+
+        def __init__(self, *args: object, **kwargs: object) -> None:
+            pass
+
+        async def run(self, source: Source) -> Document:
+            captured["source"] = source
+            return Document(
+                source=source, blocks=[Block(kind="paragraph", text="ok")]
+            )
+
+    monkeypatch.setitem(cli_mod._BACKENDS, "stub", _StubBackend)  # type: ignore[arg-type]
+
+    result = runner.invoke(
+        app,
+        ["parse", str(rel), "--no-cache", "--backend=stub", "--format=md"],
+        catch_exceptions=False,
+    )
+    assert result.exit_code == 0
+    assert "ok" in result.stdout
+    src = captured["source"]
+    assert src.uri.startswith("file://")
+    assert os.path.isabs(src.uri.removeprefix("file://"))
+
+
 @pytest.mark.slow
 def test_cli_parse_md(simple_text_pdf: Path) -> None:
     result = runner.invoke(app, ["parse", str(simple_text_pdf), "--format=md"])