diff --git a/taildrop/resume.go b/taildrop/resume.go
index dfcc408c3..f7bee3d95 100644
--- a/taildrop/resume.go
+++ b/taildrop/resume.go
@@ -11,7 +11,6 @@
 	"io"
 	"io/fs"
 	"os"
-	"slices"
 	"strings"
 )
 
@@ -37,10 +36,10 @@ func (cs Checksum) String() string {
 	return hex.EncodeToString(cs.cs[:])
 }
 func (cs Checksum) AppendText(b []byte) ([]byte, error) {
-	return hexAppendEncode(b, cs.cs[:]), nil
+	return hex.AppendEncode(b, cs.cs[:]), nil
 }
 func (cs Checksum) MarshalText() ([]byte, error) {
-	return hexAppendEncode(nil, cs.cs[:]), nil
+	return hex.AppendEncode(nil, cs.cs[:]), nil
 }
 func (cs *Checksum) UnmarshalText(b []byte) error {
 	if len(b) != 2*len(cs.cs) {
@@ -50,14 +49,6 @@ func (cs *Checksum) UnmarshalText(b []byte) error {
 	return err
 }
 
-// TODO(https://go.dev/issue/53693): Use hex.AppendEncode instead.
-func hexAppendEncode(dst, src []byte) []byte {
-	n := hex.EncodedLen(len(src))
-	dst = slices.Grow(dst, n)
-	hex.Encode(dst[len(dst):][:n], src)
-	return dst[:len(dst)+n]
-}
-
 // PartialFiles returns a list of partial files in [Handler.Dir]
 // that were sent (or is actively being sent) by the provided id.
 func (m *Manager) PartialFiles(id ClientID) (ret []string, err error) {
diff --git a/tka/aum.go b/tka/aum.go
index d1f079398..07a34b4f6 100644
--- a/tka/aum.go
+++ b/tka/aum.go
@@ -9,7 +9,6 @@
 	"encoding/base32"
 	"errors"
 	"fmt"
-	"slices"
 
 	"github.com/fxamacker/cbor/v2"
 	"golang.org/x/crypto/blake2s"
@@ -39,17 +38,9 @@ func (h *AUMHash) UnmarshalText(text []byte) error {
 	return nil
 }
 
-// TODO(https://go.dev/issue/53693): Use base32.Encoding.AppendEncode instead.
-func base32AppendEncode(enc *base32.Encoding, dst, src []byte) []byte {
-	n := enc.EncodedLen(len(src))
-	dst = slices.Grow(dst, n)
-	enc.Encode(dst[len(dst):][:n], src)
-	return dst[:len(dst)+n]
-}
-
 // AppendText implements encoding.TextAppender.
 func (h AUMHash) AppendText(b []byte) ([]byte, error) {
-	return base32AppendEncode(base32StdNoPad, b, h[:]), nil
+	return base32StdNoPad.AppendEncode(b, h[:]), nil
 }
 
 // MarshalText implements encoding.TextMarshaler.
diff --git a/types/key/util.go b/types/key/util.go
index f20cb4279..bdb2a06f6 100644
--- a/types/key/util.go
+++ b/types/key/util.go
@@ -53,18 +53,10 @@ func clamp25519Private(b []byte) {
 func appendHexKey(dst []byte, prefix string, key []byte) []byte {
 	dst = slices.Grow(dst, len(prefix)+hex.EncodedLen(len(key)))
 	dst = append(dst, prefix...)
-	dst = hexAppendEncode(dst, key)
+	dst = hex.AppendEncode(dst, key)
 	return dst
 }
 
-// TODO(https://go.dev/issue/53693): Use hex.AppendEncode instead.
-func hexAppendEncode(dst, src []byte) []byte {
-	n := hex.EncodedLen(len(src))
-	dst = slices.Grow(dst, n)
-	hex.Encode(dst[len(dst):][:n], src)
-	return dst[:len(dst)+n]
-}
-
 // parseHex decodes a key string of the form "<prefix><hex string>"
 // into out. The prefix must match, and the decoded base64 must fit
 // exactly into out.
diff --git a/types/logid/id.go b/types/logid/id.go
index ac4369a4e..4acac7cd5 100644
--- a/types/logid/id.go
+++ b/types/logid/id.go
@@ -39,7 +39,7 @@ func ParsePrivateID(in string) (out PrivateID, err error) {
 }
 
 func (id PrivateID) AppendText(b []byte) ([]byte, error) {
-	return hexAppendEncode(b, id[:]), nil
+	return hex.AppendEncode(b, id[:]), nil
 }
 
 func (id PrivateID) MarshalText() ([]byte, error) {
@@ -51,7 +51,7 @@ func (id *PrivateID) UnmarshalText(in []byte) error {
 }
 
 func (id PrivateID) String() string {
-	return string(hexAppendEncode(nil, id[:]))
+	return string(hex.AppendEncode(nil, id[:]))
 }
 
 func (id PrivateID) IsZero() bool {
@@ -75,7 +75,7 @@ func ParsePublicID(in string) (out PublicID, err error) {
 }
 
 func (id PublicID) AppendText(b []byte) ([]byte, error) {
-	return hexAppendEncode(b, id[:]), nil
+	return hex.AppendEncode(b, id[:]), nil
 }
 
 func (id PublicID) MarshalText() ([]byte, error) {
@@ -87,7 +87,7 @@ func (id *PublicID) UnmarshalText(in []byte) error {
 }
 
 func (id PublicID) String() string {
-	return string(hexAppendEncode(nil, id[:]))
+	return string(hex.AppendEncode(nil, id[:]))
 }
 
 func (id1 PublicID) Less(id2 PublicID) bool {
@@ -106,14 +106,6 @@ func (id PublicID) Prefix64() uint64 {
 	return binary.BigEndian.Uint64(id[:8])
 }
 
-// TODO(https://go.dev/issue/53693): Use hex.AppendEncode instead.
-func hexAppendEncode(dst, src []byte) []byte {
-	n := hex.EncodedLen(len(src))
-	dst = slices.Grow(dst, n)
-	hex.Encode(dst[len(dst):][:n], src)
-	return dst[:len(dst)+n]
-}
-
 func parseID[Bytes []byte | string](funcName string, out *[32]byte, in Bytes) (err error) {
 	if len(in) != 2*len(out) {
 		return fmt.Errorf("%s: invalid hex length: %d", funcName, len(in))